Update Github workflow.

It should no longer be deprecated and broken.

Author: switchswap

.github/workflows/gradle.yml

@@ -16,20 +16,24 @@ jobs:
 
     steps:
     # Setup
-    - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - uses: actions/checkout@v4
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
       with:
-        java-version: 1.8
+        java-version: '17'
+        distribution: 'temurin'
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
     # Cache
     - name: Cache Gradle packages
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
-        path: ~/.gradle/caches
-        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
-        restore-keys: ${{ runner.os }}-gradle
+        path: |
+          ~/.gradle/caches
+          ~/.gradle/wrapper
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+        restore-keys: |
+          ${{ runner.os }}-gradle-
     # Build
     - name: Build
       run: ./gradlew build --continue