Update gradle.yml

.github/workflows/gradle.yml

@@ -23,7 +23,10 @@ jobs:
  - name: Set execute permissions for backend gradlew
  run: chmod +x ./backend/gradlew
  working-directory: ./backend
-
+
+ - name: Setup Gradle
+ uses: gradle/actions/setup-gradle@417ae3ccd767c252f5661f1ace9f835f9654f2b5 # v3.1.0
+
  - name: Build backend with Gradle Wrapper
  run: ./gradlew build
  working-directory: ./backend