Bump subosito/flutter-action in the github-actions group (#3111)

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


Updates `subosito/flutter-action` from 2.17.0 to 2.18.0
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](subosito/flutter-action@74af56c...f2c4f66)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/dart_services.yml

@@ -27,7 +27,7 @@ jobs:
         sdk: [stable, beta, main]
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: subosito/flutter-action@74af56c5ed2697ba4621264652728e8d217e53d3
+      - uses: subosito/flutter-action@f2c4f6686ca8e8d6e6d0f28410eeef506ed66aff
         with:
             channel: ${{ matrix.sdk }}
       - run: flutter --version

.github/workflows/dartpad_ui.yml

@@ -24,7 +24,7 @@ jobs:
         working-directory: pkgs/dartpad_ui/
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: subosito/flutter-action@74af56c5ed2697ba4621264652728e8d217e53d3
+      - uses: subosito/flutter-action@f2c4f6686ca8e8d6e6d0f28410eeef506ed66aff
         with:
           channel: main
       - run: flutter --version

.github/workflows/samples.yml

@@ -24,7 +24,7 @@ jobs:
         working-directory: pkgs/samples/
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
-      - uses: subosito/flutter-action@74af56c5ed2697ba4621264652728e8d217e53d3
+      - uses: subosito/flutter-action@f2c4f6686ca8e8d6e6d0f28410eeef506ed66aff
       - run: flutter pub get
       - run: flutter analyze
       - run: dart format --set-exit-if-changed .