fix outdated workflow

Author: Oribuin

.github/workflows/gradle.yml

@@ -12,34 +12,35 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - name: Set up JDK 16
-        uses: actions/setup-java@v2.5.0
+      - uses: actions/checkout@v3
+      - name: Restore gradle.properties
+        env:
+          GRADLE_PROPERTIES: ${{ secrets.GRADLE_PROPERTIES }}
+        shell: bash
+        run: |
+          mkdir -p ~/.gradle/
+          echo "GRADLE_USER_HOME=${HOME}/.gradle" >> $GITHUB_ENV
+          echo "${GRADLE_PROPERTIES}" > ~/.gradle/gradle.properties
+      - name: Set up JDK 21
+        uses: actions/setup-java@v2.5.1
         with:
           distribution: 'temurin'
-          java-version: 16
-
+          java-version: '21'
       - name: Cache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/gradle-wrapper.properties') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
-
       - name: Change wrapper permissions
         run: chmod +x ./gradlew
-
-
       - name: Build artifacts
         run: ./gradlew build
-
       - name: Upload a Build Artifact
-        uses: actions/upload-artifact@v2.3.1
+        uses: actions/upload-artifact@v4
         with:
           name: EternalTags
           path: ./build/libs/EternalTags-**.jar