Fix old node version warning

Author: stoecker

.github/workflows/ant.yml

@@ -26,7 +26,7 @@ jobs:
       release_needed: ${{ steps.create_release_needed.outputs.release_needed }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: ${{ (github.repository == 'JOSM/changeset-viewer' && github.ref_type == 'branch' && github.ref_name == 'master' && github.event_name != 'schedule' && github.event_name != 'pull_request') && '0' || '1' }}