build(deps): bump flatpak/flatpak-github-actions/flatpak-builder from 6.7 to 6.8 (#14115)

Bumps
[flatpak/flatpak-github-actions/flatpak-builder](https://github.com/flatpak/flatpak-github-actions)
from 6.7 to 6.8.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/flatpak/flatpak-github-actions/releases">flatpak/flatpak-github-actions/flatpak-builder's
releases</a>.</em></p>
<blockquote>
<h2>v6.8</h2>
<ul>
<li>Add saveCache flag</li>
<li>Add ability to override artifact name</li>
<li>Add buildDebugBundle flag</li>
<li>Update tests, documentation and dependencies</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="7932741660"><code>7932741</code></a>
Update all dependencies and regenerate dist</li>
<li><a
href="09e3d61868"><code>09e3d61</code></a>
readme: Don't specify setting cache key to github.sha (<a
href="https://redirect.github.com/flatpak/flatpak-github-actions/issues/261">#261</a>)</li>
<li><a
href="23e622281a"><code>23e6222</code></a>
Update runtime versions and docker images to latest</li>
<li><a
href="a3ab43f581"><code>a3ab43f</code></a>
flatpak-builder: Add saveCache flag</li>
<li><a
href="8e357b1556"><code>8e357b1</code></a>
ci: Remove unnecessary 'needs' from debug bundle job</li>
<li><a
href="26e19caa3a"><code>26e19ca</code></a>
ci: Add test for artifact-name</li>
<li><a
href="06d246b4d5"><code>06d246b</code></a>
flatpak-builder: Add ability to override artifact name</li>
<li><a
href="a262264771"><code>a262264</code></a>
ci: Add job that uses build-debug-bundle</li>
<li><a
href="f7362292df"><code>f736229</code></a>
flatpak-builder: Add buildDebugBundle flag</li>
<li><a
href="3b10954431"><code>3b10954</code></a>
ci: Update actions to versions using Node 24</li>
<li>See full diff in <a
href="401fe28a83...7932741660">compare
view</a></li>
</ul>
</details>
<br />


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</details>

.github/workflows/flatpak.yml

@@ -41,7 +41,7 @@ jobs:
           mkdir dist
           tar --verbose --extract --strip-components 1 --directory dist --file ghostty-source.tar.gz
 
-      - uses: flatpak/flatpak-github-actions/flatpak-builder@401fe28a8384095fc1531b9d320b292f0ee45adb # v6.7
+      - uses: flatpak/flatpak-github-actions/flatpak-builder@79327416609af08178ad73b352877e51450790b3 # v6.8
         with:
           bundle: com.mitchellh.ghostty
           manifest-path: dist/flatpak/com.mitchellh.ghostty.yml