update gh action build

Signed-off-by: Lukas Jungmann <lukas.jungmann@oracle.com>

.github/workflows/maven.yml

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2021, 2023 Contributors to the Eclipse Foundation
+# Copyright (c) 2021, 2024 Contributors to the Eclipse Foundation
 #
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License v. 2.0 which is available at
@@ -29,13 +29,13 @@ jobs:
 
     strategy:
       matrix:
-        java_version: [ 8, 11, 17 ]
+        java_version: [ 8, 17, 21 ]
 
     steps:
       - name: Checkout for build
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up JDK
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: 'zulu'
           java-version: ${{ matrix.java_version }}