Bump actions/configure-pages from 2 to 3

Bumps [actions/configure-pages](https://github.com/actions/configure-pages) from 2 to 3.
- [Release notes](https://github.com/actions/configure-pages/releases)
- [Commits](actions/configure-pages@v2...v3)

---
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/ci.yml

@@ -228,7 +228,7 @@ jobs:
 
             # Setup GitHub Pages to easily deploy to it.
             -   name: Setup GitHub Pages
-                uses: actions/configure-pages@v2
+                uses: actions/configure-pages@v3
 
             # Build documentation with `rustdoc`.
             -   name: Build documentation