⬆️ Upgrade subosito/flutter-action action to v2.21.0 (#37)

Author: Friedinger

.github/workflows/dart.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
-      - uses: subosito/flutter-action@fd55f4c5af5b953cc57a2be44cb082c8f6635e8e # v2
+      - uses: subosito/flutter-action@fd55f4c5af5b953cc57a2be44cb082c8f6635e8e # v2.21.0
         with:
           channel: stable
           cache: true

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Get files
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
-      - uses: subosito/flutter-action@fd55f4c5af5b953cc57a2be44cb082c8f6635e8e # v2
+      - uses: subosito/flutter-action@fd55f4c5af5b953cc57a2be44cb082c8f6635e8e # v2.21.0
         with:
           channel: stable
           cache: true