Update build action

Author: untoldwind

.github/workflows/gradle.yml

@@ -17,13 +17,12 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
-    - uses: actions/setup-java@v1
+    - uses: actions/checkout@v6
+    - uses: actions/setup-java@v5
       with:
-        java-version: 11
-    - name: Grant execute permission for gradlew
-      run: chmod +x gradlew
+        java-version: 21
+          distribution: "temurin"
+          cache: "gradle"
+
     - name: Build everything and run all tests
-      uses: gradle/gradle-build-action@v2
-      with:
-        arguments: build
+      run: ./gradlew build