Bump actions/checkout from 5 to 6 (#9)

Author: dependabot[bot]

.github/workflows/push.yml

@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Lint Code Base
         uses: docker://ghcr.io/github/super-linter:slim-v4
         env: