Revert "Bump subosito/flutter-action from 2.19.0 to 2.20.0" (#2325)

Author: jtmcdole

.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@395322a6cded4e9ed503aebd4cc1965625f8e59a
+      - uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046
         with:
           channel: ${{ matrix.flutter_version }}
       - run: dart --version