chore(deps): update subosito/flutter-action action to v2.20.0 (#479)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -40,7 +40,7 @@ jobs:
           fetch-depth: 1
       - name: 🐦 Set up Flutter
         id: flutter
-        uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046 # v2.19.0
+        uses: subosito/flutter-action@395322a6cded4e9ed503aebd4cc1965625f8e59a # v2.20.0
         with:
           channel: ${{ env.FLUTTER_CHANNEL }}
           flutter-version-file: pubspec.yaml
@@ -124,7 +124,7 @@ jobs:
           fetch-depth: 1
       - name: 🐦 Set up Flutter
         id: flutter
-        uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046 # v2.19.0
+        uses: subosito/flutter-action@395322a6cded4e9ed503aebd4cc1965625f8e59a # v2.20.0
         with:
           channel: ${{ env.FLUTTER_CHANNEL }}
           flutter-version-file: pubspec.yaml
@@ -187,7 +187,7 @@ jobs:
           fetch-depth: 1
       - name: 🐦 Set up Flutter
         id: flutter
-        uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046 # v2.19.0
+        uses: subosito/flutter-action@395322a6cded4e9ed503aebd4cc1965625f8e59a # v2.20.0
         with:
           channel: ${{ env.FLUTTER_CHANNEL }}
           flutter-version-file: pubspec.yaml
@@ -236,7 +236,7 @@ jobs:
           fetch-depth: 1
       - name: 🐦 Set up Flutter
         id: flutter
-        uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046 # v2.19.0
+        uses: subosito/flutter-action@395322a6cded4e9ed503aebd4cc1965625f8e59a # v2.20.0
         with:
           channel: ${{ env.FLUTTER_CHANNEL }}
           flutter-version-file: pubspec.yaml
@@ -290,7 +290,7 @@ jobs:
           fetch-depth: 1
       - name: 🐦 Set up Flutter
         id: flutter
-        uses: subosito/flutter-action@e938fdf56512cc96ef2f93601a5a40bde3801046 # v2.19.0
+        uses: subosito/flutter-action@395322a6cded4e9ed503aebd4cc1965625f8e59a # v2.20.0
         with:
           channel: ${{ env.FLUTTER_CHANNEL }}
           flutter-version-file: pubspec.yaml