Bump subosito/flutter-action from 2.19.0 to 2.20.0

Bumps [subosito/flutter-action](https://github.com/subosito/flutter-action) from 2.19.0 to 2.20.0.
- [Release notes](https://github.com/subosito/flutter-action/releases)
- [Commits](subosito/flutter-action@e938fdf...395322a)

---
updated-dependencies:
- dependency-name: subosito/flutter-action
  dependency-version: 2.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/flutter-ci.yml

@@ -31,7 +31,7 @@ jobs:
         with:
           distribution: "zulu" # See https://github.com/actions/setup-java#supported-distributions
           java-version: "17"
-      - uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046
+      - uses: subosito/flutter-action@395322a6cded4e9ed503aebd4cc1965625f8e59a
         with:
           channel: ${{ matrix.flutter_version }}
       - run: dart --version