build: Update GitHub actions setup-java to v4

Author: atferrys

.github/workflows/gradle-build.yml

@@ -11,7 +11,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Set up JDK 8
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v4
         with:
           java-version: 8
           distribution: 'adopt'