Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/maven.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up JDK 17
       uses: actions/setup-java@v4
       with: