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

Author: renovate[bot]

.github/workflows/build-example.yml

@@ -25,7 +25,7 @@ jobs:
           distribution: 'zulu'
           java-version: '17'
 
-      - uses: subosito/flutter-action@v2.12.0
+      - uses: subosito/flutter-action@v2.20.0
         with:
           channel: ${{ matrix.channel }}
 
@@ -76,7 +76,7 @@ jobs:
           distribution: 'zulu'
           java-version: '17'
 
-      - uses: subosito/flutter-action@v2.12.0
+      - uses: subosito/flutter-action@v2.20.0
         with:
           flutter-version: ${{ matrix.version }}
 

.github/workflows/tests.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: subosito/flutter-action@v2.12.0
+      - uses: subosito/flutter-action@v2.20.0
         with:
           channel: ${{ matrix.channel }}
 
@@ -54,7 +54,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: subosito/flutter-action@v2.12.0
+      - uses: subosito/flutter-action@v2.20.0
         with:
           flutter-version: ${{ matrix.version }}