chore(deps): update actions/checkout action from vv4 to v6

Author: renovate[bot]

.github/workflows/push.yml

@@ -19,7 +19,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'ci skip')"
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Copy maven settings