chore(deps-dev): Bump jsii from 5.6.7 to 5.6.8 (#552)

Bumps [jsii](https://github.com/aws/jsii-compiler) from 5.6.7 to 5.6.8.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/aws/jsii-compiler/releases">jsii's releases</a>.</em></p>
<blockquote>
<h2>v5.6.8</h2>
<h2>What's Changed</h2>
<ul>
<li>chore(deps): upgrade dependencies by <a href="https://github.com/aws-cdk-automation"><code>@​aws-cdk-automation</code></a> in <a href="https://redirect.github.com/aws/jsii-compiler/pull/1690">aws/jsii-compiler#1690</a></li>
<li>chore(deps): upgrade dependencies by <a href="https://github.com/aws-cdk-automation"><code>@​aws-cdk-automation</code></a> in <a href="https://redirect.github.com/aws/jsii-compiler/pull/1694">aws/jsii-compiler#1694</a></li>
<li>chore(deps): upgrade dependencies by <a href="https://github.com/aws-cdk-automation"><code>@​aws-cdk-automation</code></a> in <a href="https://redirect.github.com/aws/jsii-compiler/pull/1698">aws/jsii-compiler#1698</a></li>
<li>chore(deps): upgrade dependencies by <a href="https://github.com/aws-cdk-automation"><code>@​aws-cdk-automation</code></a> in <a href="https://redirect.github.com/aws/jsii-compiler/pull/1702">aws/jsii-compiler#1702</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/aws/jsii-compiler/compare/v5.6.7...v5.6.8">https://github.com/aws/jsii-compiler/compare/v5.6.7...v5.6.8</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/aws/jsii-compiler/commit/b1860735c7192438b1b00bb4ce5dea72f794276e"><code>b186073</code></a> chore(deps): upgrade dependencies (<a href="https://redirect.github.com/aws/jsii-compiler/issues/1702">#1702</a>)</li>
<li><a href="https://github.com/aws/jsii-compiler/commit/acef0a19cace9d1a2621edc412e4c46d5aa13cdc"><code>acef0a1</code></a> chore(deps): upgrade dependencies (<a href="https://redirect.github.com/aws/jsii-compiler/issues/1698">#1698</a>)</li>
<li><a href="https://github.com/aws/jsii-compiler/commit/45eba406df215860748b43ab34100195a8859bfe"><code>45eba40</code></a> chore(deps): upgrade dependencies (<a href="https://redirect.github.com/aws/jsii-compiler/issues/1694">#1694</a>)</li>
<li><a href="https://github.com/aws/jsii-compiler/commit/d827d2025a5cc1201e97adb3479339c153a8fee1"><code>d827d20</code></a> chore(deps): upgrade dependencies (<a href="https://redirect.github.com/aws/jsii-compiler/issues/1690">#1690</a>)</li>
<li>See full diff in <a href="https://github.com/aws/jsii-compiler/compare/v5.6.7...v5.6.8">compare view</a></li>
</ul>
</details>
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