Add Gradle setup step to workflow

Author: LeZi9916

.github/workflows/main.yml

@@ -155,6 +155,11 @@ jobs:
           java-version: '17' 
           cache: 'gradle'
 
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+        with:
+          gradle-version: '9.1.0'
+
       - name: Install Android NDK via SDK Manager
         run: |
           echo "y" | $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --install "ndk;23.1.7779620"