build(deps): bump json_annotation from 4.7.0 to 4.8.0 (#144)

Bumps [json_annotation](https://github.com/google/json_serializable.dart) from 4.7.0 to 4.8.0.
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<summary>Commits</summary>
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<li><a href="https://github.com/google/json_serializable.dart/commit/44d0080ac8dc5e116af2bd00d5ee5e07f630b7dc"><code>44d0080</code></a> Prepare to release pkg:json_annotation v4.8.0 (<a href="https://github-redirect.dependabot.com/google/json_serializable.dart/issues/1268">#1268</a>)</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/58db73b4c2c3a0c393e4e7a68f499d28051908ac"><code>58db73b</code></a> Latest mono_repo (<a href="https://github-redirect.dependabot.com/google/json_serializable.dart/issues/1267">#1267</a>)</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/388010ea13310c66e75f7204d01ecbbca0e9bf32"><code>388010e</code></a> checked_yaml: drop dep overrides (<a href="https://github-redirect.dependabot.com/google/json_serializable.dart/issues/1266">#1266</a>)</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/e8f2b32d94c17c009d8b00eca846b860e740a784"><code>e8f2b32</code></a> Prepare checked_yaml v2.0.2 release (<a href="https://github-redirect.dependabot.com/google/json_serializable.dart/issues/1265">#1265</a>)</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/b5c7af1c06b97e8ca134da1ceeba84c99a5d7d15"><code>b5c7af1</code></a> Work around SDK issue in v3.0-dev (<a href="https://github-redirect.dependabot.com/google/json_serializable.dart/issues/1262">#1262</a>)</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/c6836ae94b99b721083fd904288f844f933187b4"><code>c6836ae</code></a> update example readme to use &quot;dart run&quot; over &quot;pub run&quot; (<a href="https://github-redirect.dependabot.com/google/json_serializable.dart/issues/1258">#1258</a>)</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/776df7cbb67ce368262612b34758bb780459ac46"><code>776df7c</code></a> Add JsonKey.includeFromJson/includeToJson - allow explicit control of seriali...</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/7638402cec7e4e6c732ffa9efcc24db3386dd999"><code>7638402</code></a> tool: share formatter</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/f6614d3962560546ad45c00fa6c1ae75f9f6add8"><code>f6614d3</code></a> Refactor some enum helpers</li>
<li><a href="https://github.com/google/json_serializable.dart/commit/16284aa541a835c8b368091d793b2956ebfd8741"><code>16284aa</code></a> Update re-response logic (<a href="https://github-redirect.dependabot.com/google/json_serializable.dart/issues/1253">#1253</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/google/json_serializable.dart/compare/json_annotation-v4.7.0...json_annotation-v4.8.0">compare view</a></li>
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