Bump actions/setup-java from 5 to 6 (#712)

Author: dependabot[bot]

.github/workflows/maven.yml

@@ -25,7 +25,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v7
     - name: Set up JDK
-      uses: actions/setup-java@v5
+      uses: actions/setup-java@v6
       with:
         java-version: 25
         distribution: 'sapmachine'