Bumps [dart-lang/setup-dart](https://github.com/dart-lang/setup-dart) from 1.6.2 to 1.6.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dart-lang/setup-dart/releases">dart-lang/setup-dart's releases</a>.</em></p>
<blockquote>
<h2>v1.6.4</h2>
<ul>
<li>Rebuild JS code to include changes from v1.6.3</li>
</ul>
<h2>v1.6.3</h2>
<ul>
<li>Roll <code>undici</code> dependency to address <a href="https://github.com/nodejs/undici/security/advisories/GHSA-m4v8-wqvr-p9f7">CVE-2024-30260</a> and <a href="https://github.com/nodejs/undici/security/advisories/GHSA-9qxr-qj54-h672">CVE-2024-30261</a>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/dart-lang/setup-dart/blob/main/CHANGELOG.md">dart-lang/setup-dart's changelog</a>.</em></p>
<blockquote>
<h2>v1.6.4</h2>
<ul>
<li>Rebuild JS code.</li>
</ul>
<h2>v1.6.3</h2>
<ul>
<li>Roll <code>undici</code> dependency to address <a href="https://github.com/nodejs/undici/security/advisories/GHSA-m4v8-wqvr-p9f7">CVE-2024-30260</a> and <a href="https://github.com/nodejs/undici/security/advisories/GHSA-9qxr-qj54-h672">CVE-2024-30261</a>.</li>
</ul>
<h2>v1.6.2</h2>
<ul>
<li>Switch to running the workflow on <code>node20`` from </code>node16`. See also
<a href="https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/">Transitioning from Node 16 to Node 20</a>.</li>
</ul>
<h2>v1.6.1</h2>
<ul>
<li>Updated the google storage url for <code>main</code> channel releases.</li>
</ul>
<h2>v1.6.0</h2>
<ul>
<li>Enable provisioning of the latest Dart SDK patch release by specifying just
the major and minor version (e.g. <code>3.2</code>).</li>
</ul>
<h2>v1.5.1</h2>
<ul>
<li>No longer test the <code>setup-dart</code> action on pre-2.12 SDKs.</li>
<li>Upgrade JS interop code to use extension types
(the new name for inline classes).</li>
<li>The upcoming rename of the <code>be</code> channel to <code>main</code> is now supported with
forward compatibility that switches when the rename happens.</li>
</ul>
<h2>v1.5.0</h2>
<ul>
<li>Re-wrote the implementation of the action into Dart.</li>
<li>Auto-detect the platform architecture (<code>x64</code>, <code>ia32</code>, <code>arm</code>, <code>arm64</code>).</li>
<li>Improved the caching and download resilience of the sdk.</li>
<li>Added a new action output: <code>dart-version</code> - the installed version of the sdk.</li>
</ul>
<h2>v1.4.0</h2>
<ul>
<li>Automatically create OIDC token for pub.dev.</li>
<li>Add a reusable workflow for publishing.</li>
</ul>
<h2>v1.3.0</h2>
<ul>
<li>The install location of the Dart SDK is now available</li>
</ul>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dart-lang/setup-dart/commit/f0ead981b4d9a35b37f30d36160575d60931ec30"><code>f0ead98</code></a> Rebuild JS code (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/129">#129</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/65c82982aa686933bf10d50aced7a27b2b63f2a6"><code>65c8298</code></a> Update CHANGELOG.md (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/128">#128</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/57338d64c065775c2cf86eaf665316ea44e0249d"><code>57338d6</code></a> Bump undici from 5.28.3 to 5.28.4 (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/127">#127</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/05d3f5ec28dca4e3ae8991f2be7828a62942f8a8"><code>05d3f5e</code></a> Bump <code>@�actions/http-client</code> from 2.2.0 to 2.2.1 (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/126">#126</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/b8c0b77d1f6fb52c5ddff2fc3da6cfa3f9585860"><code>b8c0b77</code></a> no longer specify the inline-class experiment flag (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/125">#125</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/b9952d818df9b43bab696de0e1b7bbf09464a829"><code>b9952d8</code></a> Bump undici from 5.27.0 to 5.28.3 (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/124">#124</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/9a6ee8904aa6a1fa76b02bb3e7b0ec30cddcaaac"><code>9a6ee89</code></a> Bump dart-lang/setup-dart from 1.6.0 to 1.6.2 (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/123">#123</a>)</li>
<li>See full diff in <a href="https://github.com/dart-lang/setup-dart/compare/fedb1266e91cf51be2fdb382869461a434b920a3...f0ead981b4d9a35b37f30d36160575d60931ec30">compare view</a></li>
</ul>
</details>
<br />

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dependabot

* fix: Use `.zip` in archive path

Fixes #118

Ensures that downloads of the Dart SDK zip file carry the `.zip` extension so that subsequent calls to `Expand-Archive` on Windows succeed.

## Notes

- The diff of `index.mjs` is quite large. I believe this is due to the version of Node I'm using (`20.7.0`). Happy to use a different version to keep the diff small, but wasn't sure which one is currently used. This could be noted in `package.json` to ensure alignment with external contributions.

* Update link

* Update changelog

* Reformat and sign w/ Dart 3.4.1