Use inbuilt setup-java for build caching.

.github/workflows/ci.yml

@@ -21,13 +21,7 @@ jobs:
           java-version: ${{ matrix.java }}
           distribution: temurin
           check-latest: true
-
+          cache: "gradle"
-      - name: Cache Gradle dependencies
-        uses: actions/cache@v2.1.6
-        with:
-          path: ~/.gradle/caches
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
-          restore-keys: ${{ runner.os }}-gradle
 
       - name: Run Build
         run: chmod +x ./gradlew && ./gradlew build