ci: github build workflow fixed

Author: huksley

.github/workflows/maven.yaml

@@ -9,8 +9,9 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
+        uses: actions/setup-java@v2
         with:
-          java-version: 1.8
+          java-version: '21'
+          distribution: 'adopt'
       - name: Build with Maven
         run: mvn clean package