chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/mvn-build.yml

@@ -8,7 +8,7 @@ jobs:
       pull-requests: write
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
     - name: Setup Java
       uses: actions/setup-java@v4
       with:

.github/workflows/mvn-release.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       - name: Set up Java environment
         uses: actions/setup-java@v4
         with: