chore(deps-dev): Bump jsii-docgen from 1.8.88 to 1.8.89 (#350)

Bumps [jsii-docgen](https://github.com/eladb/jsii-docgen) from 1.8.88 to 1.8.89.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/eladb/jsii-docgen/releases">jsii-docgen's releases</a>.</em></p>
<blockquote>
<h2>v1.8.89</h2>
<h3><a href="https://github.com/eladb/jsii-docgen/compare/v1.8.88...v1.8.89">1.8.89</a> (2021-06-07)</h3>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/cdklabs/jsii-docgen/commit/5879c2839dce2fafdca774e93e4fd2193b111aa5"><code>5879c28</code></a> chore(deps): upgrade projen (<a href="https://github-redirect.dependabot.com/eladb/jsii-docgen/issues/334">#334</a>)</li>
<li>See full diff in <a href="https://github.com/eladb/jsii-docgen/compare/v1.8.88...v1.8.89">compare view</a></li>
</ul>
</details>
<br />


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yarn.lock

@@ -3599,9 +3599,9 @@ jsii-diff@^1.9.0:
     yargs "^16.2.0"
 
 jsii-docgen@^1.3.2:
-  version "1.8.88"
-  resolved "https://registry.yarnpkg.com/jsii-docgen/-/jsii-docgen-1.8.88.tgz#b0eba7d98f20bb0aeecb4bb8dc13b00f985b3b85"
-  integrity sha512-CTW585S3G0mjRuVQBZDke2eE+E5DwDavH10LxOJbZWYT7XpDyKw+LytqwEofjPfy426Yrq3wzvKrjEL7lcoagg==
+  version "1.8.89"
+  resolved "https://registry.yarnpkg.com/jsii-docgen/-/jsii-docgen-1.8.89.tgz#81f71da20161e293ef9d08de2b6a8153cbf12584"
+  integrity sha512-gb6N86ePVwGlQqZjkOzR70z0QpTh51P6/+gPGlRva5ndVIO5CzRv7qAFQhHcBgv7dTkH34qu8ncIUkMxMXCzpw==
   dependencies:
     "@jsii/spec" "^1.30.0"
     fs-extra "^9.1.0"