Bump actions/configure-pages from 3 to 4

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

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/docbuild.yml

@@ -24,7 +24,7 @@ jobs:
         make -C docs html
     - name: Setup Pages
       if: github.ref_name == 'main'
-      uses: actions/configure-pages@v3
+      uses: actions/configure-pages@v4
     - name: Upload Pages artifact
       if: github.ref_name == 'main'
       uses: actions/upload-pages-artifact@v1