Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/gh-pages.yml

@@ -19,7 +19,7 @@ jobs:
       GIT_AUTHOR_EMAIL: github-actions[bot]@users.noreply.github.com
     steps:
     # Fetch the source and the latest gh-pages.
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - run: git fetch origin gh-pages:refs/remotes/origin/gh-pages
 
     # Account info from https://api.github.com/users/github-actions%5Bbot%5D