Update actions/setup-java action to v3

Author: renovate-bot

.github/workflows/flutter.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - uses: actions/setup-java@v2
+      - uses: actions/setup-java@v3
         with:
           distribution: 'zulu'
           java-version: '11'