Bump actions/deploy-pages from 3 to 4

Bumps [actions/deploy-pages](https://github.com/actions/deploy-pages) from 3 to 4.
- [Release notes](https://github.com/actions/deploy-pages/releases)
- [Commits](actions/deploy-pages@v3...v4)

---
updated-dependencies:
- dependency-name: actions/deploy-pages
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -56,4 +56,4 @@ jobs:
     steps:
       - id: deployment
         name: Deploy to GitHub Pages
-        uses: actions/deploy-pages@v3
+        uses: actions/deploy-pages@v4