Bump subosito/flutter-action from 2.15.0 to 2.16.0 (#231)

Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 2.15.0 to 2.16.0.
<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>v2.16.0</h2>
<p>This release introduces the <code>dry-run</code> option, which lets you only get action outputs without downloading Flutter. This can be useful if you want to set up some automations to be notified about new Flutter releases.</p>
<pre lang="yaml"><code>steps:
  - name: Clone repository
  - uses: actions/checkout@v4
  - name: Set up Flutter
    uses: subosito/flutter-action@v2
    id: flutter-action
    with:
      channel: stable
      dry-run: true
  - run: |
      # Always print the latest stable version.
      echo CHANNEL=${{ steps.flutter-action.outputs.CHANNEL }}
      echo VERSION=${{ steps.flutter-action.outputs.VERSION }}
    shell: bash
</code></pre>
<p>Thank you <a href="https://github.com/kzrnm"><code>@�kzrnm</code></a> for suggesting and implementing it in <a href="https://redirect.github.com/subosito/flutter-action/issues/270">#270</a>!</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/subosito/flutter-action/commit/44ac965b96f18d999802d4b807e3256d5a3f9fa1"><code>44ac965</code></a> Add dry-run (<a href="https://redirect.github.com/subosito/flutter-action/issues/270">#270</a>)</li>
<li><a href="https://github.com/subosito/flutter-action/commit/980391a6c51b6f81252a39f1a63c5c3e64ada99c"><code>980391a</code></a> more README fixes (<a href="https://redirect.github.com/subosito/flutter-action/issues/292">#292</a>)</li>
<li>See full diff in <a href="https://github.com/subosito/flutter-action/compare/3d804929922b667a63a229bc59037807f969e885...44ac965b96f18d999802d4b807e3256d5a3f9fa1">compare view</a></li>
</ul>
</details>
<br />

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</details>

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633
 
       - name: install Flutter sdk
-        uses: subosito/flutter-action@3d804929922b667a63a229bc59037807f969e885
+        uses: subosito/flutter-action@44ac965b96f18d999802d4b807e3256d5a3f9fa1
         with:
           channel: 'master'