Bump dart-lang/setup-dart from 1.5.1 to 1.6.0 (#44)

Bumps [dart-lang/setup-dart](https://github.com/dart-lang/setup-dart) from 1.5.1 to 1.6.0.
<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>v1.6.0</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>
</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>v1.6.0</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
in an environment variable, <code>DART_HOME</code>
(<a href="https://redirect.github.com/dart-lang/setup-dart/issues/43">#43</a>).</li>
<li>Fixed an issue where cached downloads could lead to unzip issues
on self-hosted runners
(<a href="https://redirect.github.com/dart-lang/setup-dart/issues/35">#35</a>).</li>
</ul>
<h2>v1.2.0</h2>
<ul>
<li>Fixed a path issue impacting git dependencies on Windows.</li>
</ul>
<h2>v1.1.0</h2>
<ul>
<li>Added a <code>flavor</code> option setup.sh to allow downloading unpublished builds.</li>
</ul>
<h2>v1.0.0</h2>
<ul>
<li>Promoted to 1.0 stable.</li>
</ul>
<h2>v0.5</h2>
<ul>
<li>Fixed a Windows <code>pub global activate</code> path issue.</li>
</ul>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/dart-lang/setup-dart/commit/b64355ae6ca0b5d484f0106a033dd1388965d06d"><code>b64355a</code></a> debugging issues around specifying the latest patch release (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/108">#108</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/cd21d0e7475915575e022d2cacd7c54e5026e159"><code>cd21d0e</code></a> Bump dart-lang/setup-dart from 1.5.0 to 1.5.1 (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/110">#110</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/2118353f672662accb7785f6afd28ab61c7cfec9"><code>2118353</code></a> Bump actions/checkout from 3 to 4 (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/109">#109</a>)</li>
<li><a href="https://github.com/dart-lang/setup-dart/commit/8ef13bcca6c9bb2219391088bc9d968125f68406"><code>8ef13bc</code></a> support sdk version wildcard format (<a href="https://redirect.github.com/dart-lang/setup-dart/issues/106">#106</a>)</li>
<li>See full diff in <a href="https://github.com/dart-lang/setup-dart/compare/8a4b97ea2017cc079571daec46542f76189836b1...b64355ae6ca0b5d484f0106a033dd1388965d06d">compare view</a></li>
</ul>
</details>
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