Update icu requirement from 0.5.0 to 0.6.0 in /boa_engine (#2078)

Updates the requirements on [icu](https://github.com/unicode-org/icu4x) to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/unicode-org/icu4x/releases">icu's releases</a>.</em></p>
<blockquote>
<h2>ICU4X 0.5.0 (January 31, 2022)</h2>
<p>ICU4X 0.5.0 is our major winter release.  Key changes:</p>
<ol>
<li>Major improvements to the <code>datetime</code> component, including support for non-gregorian calendars, week-of-year, and eras</li>
<li>Lots of improvements to the <code>properties</code> component, including support for <code>Canonical_Combining_Class</code>, <code>Script_Extensions</code>, <code>Grapheme_Cluster_Break</code>, <code>Word_Break</code>, <code>Sentence_Break</code>.</li>
<li>Improvements to our data infrastructure crates <code>yoke</code> and <code>zerovec</code></li>
</ol>
<p>There are also bug fixes and feature improvements in other components including <code>LocaleCanonicalizer</code>.  For more details, see the <a href="https://github.com/unicode-org/icu4x/blob/main/CHANGELOG.md#icu4x-050-jan-31-2022">changelog</a>.</p>
<p>We hope to continue bringing early adopters onboard as we eye a stable 1.0 release in the first half of 2022.</p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/unicode-org/icu4x/blob/main/CHANGELOG.md">icu's changelog</a>.</em></p>
<blockquote>
<h2>icu4x 0.5.0 (Jan 31, 2022)</h2>
<ul>
<li>General data model
<ul>
<li><code>DataPayload</code> no longer needs a lifetime (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1297">#1297</a>, <a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1279">#1279</a>)</li>
<li>Re-write ResourceKey (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1511">#1511</a>)</li>
<li>Rewrite ErasedDataProvider as AnyProvider (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1495">#1495</a>)</li>
<li>Add EitherProvider and rename IterableDataProviderCore to IterableProvider (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1455">#1455</a>)</li>
<li>Change DataRequest to be borrowed in BufferProvider (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1416">#1416</a>)</li>
<li>Replace SerdeDeDataProvider with BufferProvider (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1369">#1369</a>, <a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1384">#1384</a>)</li>
</ul>
</li>
<li>Components
<ul>
<li><code>calendar</code>:
<ul>
<li>Julian, Japanese, and Buddhist calendars (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1351">#1351</a>, <a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1394">#1394</a>, <a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1305">#1305</a>)</li>
<li><code>DateTimeFormat</code> integration (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1339">#1339</a>)</li>
<li>Bugfix around arithmetic (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1352">#1352</a>)</li>
</ul>
</li>
<li><code>datetime</code>:
<ul>
<li>Week-of-year support (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1206">#1206</a>)</li>
<li><code>DateTimeFormat::resolve_components()</code> (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1362">#1362</a>)</li>
<li>Era formatting (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1346">#1346</a>)</li>
<li><code>TimeZoneFormatConfig</code> (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1256">#1256</a>)</li>
<li>New data model for organizing calendar data (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1300">#1300</a>)</li>
<li>Bugfix around missing localized strings in time zone data (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1405">#1405</a>)</li>
</ul>
</li>
<li><code>decimal</code>: No updates</li>
<li><code>locale_canonicalizer</code>:
<ul>
<li>Bugfix in maximization (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1171">#1171</a>)</li>
<li>Update data model to use <code>LiteMap</code> (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1275">#1275</a>)</li>
</ul>
</li>
<li><code>locid</code>: No updates</li>
<li><code>plurals</code>:
<ul>
<li>Update data model to use <code>ZeroVec</code> (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1240">#1240</a>)</li>
</ul>
</li>
<li><code>properties</code>:
<ul>
<li>Rename resource key category for properties (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1406">#1406</a>)</li>
<li>Rename enums for <code>General_Category</code> (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1355">#1355</a>)</li>
<li>Implement the <code>Canonical_Combining_Class</code> property (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1347">#1347</a>)</li>
<li>Implement <code>Script_Extensions</code> property (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1353">#1353</a>)</li>
<li>Add <code>General_Category</code> predicate functions (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1310">#1310</a>)</li>
<li>Implement <code>Grapheme_Cluster_Break</code>, <code>Word_Break</code>, and <code>Sentence_Break</code> Unicode properties (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1233">#1233</a>)</li>
</ul>
</li>
</ul>
</li>
<li>Utilities
<ul>
<li><code>codepointtrie</code>: No changes</li>
<li><code>deduplicating_array</code>: New utility for efficient serialized representation of data with duplicates</li>
<li><code>fixed_decimal</code>:
<ul>
<li>Padding and truncation APIs (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1482">#1482</a>, <a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1507">#1507</a>, <a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1195">#1195</a>)</li>
<li>Add double-to-decimal via ryū (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1217">#1217</a>)</li>
<li>Handle exponents in <code>FixedDecimal::from_str()</code> (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1265">#1265</a>)</li>
</ul>
</li>
<li><code>litemap</code>:
<ul>
<li>Add <code>LiteMap::get_indexed()</code> and <code>LiteMap::find_index()</code></li>
<li>Handle serialization of tuples (etc) in litemaps (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1306">#1306</a>)</li>
</ul>
</li>
<li><code>pattern</code>: No updates</li>
<li><code>uniset</code>: No updates</li>
<li><code>writeable</code>:
<ul>
<li>Adding parts functionality to <code>Writeable</code> (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1438">#1438</a>)</li>
<li>Change <code>Writeable::writeable_to_string</code> to return a Cow (<a href="https://github-redirect.dependabot.com/unicode-org/icu4x/issues/1452">#1452</a>)</li>
</ul>
</li>
</ul>
</li>
</ul>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/unicode-org/icu4x/compare/icu@0.5.0...icu@0.5.0">compare view</a></li>
</ul>
</details>
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Co-authored-by: jedel1043 <jedel0124@gmail.com>