Leave aside compiling for different Java versions for now

.github/workflows/build.yml

@@ -14,18 +14,8 @@ jobs:
   build:
     runs-on: antville
 
-    strategy:
-      matrix:
-        java: [11, 17, 21]
-
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set up Java
-        uses: https://github.com/actions/setup-java@v4
-        with:
-          distribution: temurin
-          java-version: ${{ matrix.java }}
-
       - name: Compile with Gradle
         run: ./gradlew :compileJava