added pub cache and changed java version

.gitea/workflows/android_build.yml

@@ -17,12 +17,19 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
-      
+
-      - name: Setup Java
+      - name: Cache pub deps
+        uses: actions/cache@v3
+        with:
+          path: ~/.pub-cache
+          key: ${{ runner.os }}-pub-${{ hashFiles('**/pubspec.yaml') }}
+          restore-keys: ${{ runner.os }}-pub-
+
+      - name: Setup Java (Temurin 17)
         uses: actions/setup-java@v3
         with:
-          distribution: 'temurin'
+          distribution: temurin
-          java-version: '11'
+          java-version: '17'
       
       - name: Setup Flutter
         uses: subosito/flutter-action@v2