set java compile version 11

Author: brokkoli71

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Set up JDK
         uses: actions/setup-java@v3
         with:
-          java-version: '8'
+          java-version: '11'
           distribution: 'temurin'
           cache: maven