chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: mhausenblas/mkdocs-deploy-gh-pages@1.26
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}