build(deps): bump subosito/flutter-action from 2.10.0 to 2.12.0

Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 2.10.0 to 2.12.0.
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](subosito/flutter-action@v2.10.0...2783a3f)

---
updated-dependencies:
- dependency-name: subosito/flutter-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/isar.yml

@@ -80,7 +80,7 @@ jobs:
           sudo apt install -y network-manager upower
         if: matrix.os == 'ubuntu-latest' && matrix.target == 'linux'
 
-      - uses: subosito/flutter-action@48cafc24713cca54bbe03cdc3a423187d413aafa # pin@v2.10.0
+      - uses: subosito/flutter-action@2783a3f08e1baf891508463f8c6653c258246225 # pin@v2.12.0
         with:
           channel: ${{ matrix.sdk }}