chore(deps-dev): Bump cdk-nag from 2.28.67 to 2.28.68 (#1568)

Bumps [cdk-nag](https://github.com/cdklabs/cdk-nag) from 2.28.67 to 2.28.68.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/cdklabs/cdk-nag/releases">cdk-nag's releases</a>.</em></p>
<blockquote>
<h2>v2.28.68</h2>
<h3><a href="https://github.com/cdklabs/cdk-nag/compare/v2.28.67...v2.28.68">2.28.68</a> (2024-03-19)</h3>
</blockquote>
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<summary>Commits</summary>
<ul>
<li><a href="https://github.com/cdklabs/cdk-nag/commit/75acc38beab1659e63e99161297dbca4ef5a1ac6"><code>75acc38</code></a> chore(deps): upgrade dependencies (<a href="https://redirect.github.com/cdklabs/cdk-nag/issues/1635">#1635</a>)</li>
<li>See full diff in <a href="https://github.com/cdklabs/cdk-nag/compare/v2.28.67...v2.28.68">compare view</a></li>
</ul>
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