chore: enable caching for flutter-action in workflow (#108)

Author: OutdatedGuy

.github/workflows/code_quality.yml

@@ -19,6 +19,7 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           channel: "stable"
+          cache: true
       - run: flutter --version
 
       # Get flutter dependencies.
@@ -37,6 +38,7 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           channel: "stable"
+          cache: true
       - run: flutter --version
 
       # Get flutter dependencies.

.github/workflows/unit_tests.yml

@@ -20,6 +20,7 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           channel: "stable"
+          cache: true
       - run: flutter --version
 
       # Get flutter dependencies.