Bump subosito/flutter-action from 2.19.0 to 2.21.0 in the github-actions group (#252)

Bumps the github-actions group with 1 update: [subosito/flutter-action](https://github.com/subosito/flutter-action).

Updates `subosito/flutter-action` from 2.19.0 to 2.21.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/subosito/flutter-action/releases">subosito/flutter-action's releases</a>.</em></p>
<blockquote>
<h2>v2.21.0</h2>
<h2>What's Changed</h2>
<ul>
<li>Add cache hit outputs by <a href="https://github.com/beninato8"><code>@​beninato8</code></a> in <a href="https://redirect.github.com/subosito/flutter-action/pull/364">subosito/flutter-action#364</a></li>
<li>fix broken links in README by <a href="https://github.com/bartekpacia"><code>@​bartekpacia</code></a> in <a href="https://redirect.github.com/subosito/flutter-action/pull/365">subosito/flutter-action#365</a></li>
<li>Support dynamic values for PUB-CACHE-PATH by <a href="https://github.com/beninato8"><code>@​beninato8</code></a> in <a href="https://redirect.github.com/subosito/flutter-action/pull/363">subosito/flutter-action#363</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/beninato8"><code>@​beninato8</code></a> made their first contribution in <a href="https://redirect.github.com/subosito/flutter-action/pull/364">subosito/flutter-action#364</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/subosito/flutter-action/compare/v2.20.0...v2.21.0">https://github.com/subosito/flutter-action/compare/v2.20.0...v2.21.0</a></p>
<h2>v2.20.0</h2>
<h2>What's Changed</h2>
<ul>
<li>perf: Only install yq on Windows if used by <a href="https://github.com/christerswahn"><code>@​christerswahn</code></a> in <a href="https://redirect.github.com/subosito/flutter-action/pull/362">subosito/flutter-action#362</a></li>
<li>use env if it existed by <a href="https://github.com/atishoo"><code>@​atishoo</code></a> in <a href="https://redirect.github.com/subosito/flutter-action/pull/360">subosito/flutter-action#360</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/christerswahn"><code>@​christerswahn</code></a> made their first contribution in <a href="https://redirect.github.com/subosito/flutter-action/pull/362">subosito/flutter-action#362</a></li>
<li><a href="https://github.com/atishoo"><code>@​atishoo</code></a> made their first contribution in <a href="https://redirect.github.com/subosito/flutter-action/pull/360">subosito/flutter-action#360</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a href="https://github.com/subosito/flutter-action/compare/v2...v2.20.0">https://github.com/subosito/flutter-action/compare/v2...v2.20.0</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/subosito/flutter-action/commit/fd55f4c5af5b953cc57a2be44cb082c8f6635e8e"><code>fd55f4c</code></a> Support dynamic values for PUB-CACHE-PATH (<a href="https://redirect.github.com/subosito/flutter-action/issues/363">#363</a>)</li>
<li><a href="https://github.com/subosito/flutter-action/commit/ca16aee0c3591c7a2bc0536e3663cdd723e92426"><code>ca16aee</code></a> fix broken links in README (<a href="https://redirect.github.com/subosito/flutter-action/issues/365">#365</a>)</li>
<li><a href="https://github.com/subosito/flutter-action/commit/947e9c91a5355bf3e320e442fd60a6c1cdda4eec"><code>947e9c9</code></a> Add cache hit outputs (<a href="https://redirect.github.com/subosito/flutter-action/issues/364">#364</a>)</li>
<li><a href="https://github.com/subosito/flutter-action/commit/395322a6cded4e9ed503aebd4cc1965625f8e59a"><code>395322a</code></a> use env if it existed (<a href="https://redirect.github.com/subosito/flutter-action/issues/360">#360</a>)</li>
<li><a href="https://github.com/subosito/flutter-action/commit/02d6ac3427ae141a31ef2b95fe6273e5aa356429"><code>02d6ac3</code></a> perf: Only install yq on Windows if used (<a href="https://redirect.github.com/subosito/flutter-action/issues/362">#362</a>)</li>
<li>See full diff in <a href="https://github.com/subosito/flutter-action/compare/e938fdf56512cc96ef2f93601a5a40bde3801046...fd55f4c5af5b953cc57a2be44cb082c8f6635e8e">compare view</a></li>
</ul>
</details>
<br />

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Author: dependabot[bot]

.github/workflows/io_file.yml

@@ -104,7 +104,7 @@ jobs:
         working-directory: pkgs/io_file/mobile_test
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046
+      - uses: subosito/flutter-action@fd55f4c5af5b953cc57a2be44cb082c8f6635e8e
         with:
           channel: master
       - name: Enable KVM group perms
@@ -130,7 +130,7 @@ jobs:
         working-directory: pkgs/io_file/mobile_test
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046
+      - uses: subosito/flutter-action@fd55f4c5af5b953cc57a2be44cb082c8f6635e8e
         with:
           channel: master
       - uses: futureware-tech/simulator-action@dab10d813144ef59b48d401cd95da151222ef8cd