build(deps): bump actions/upload-pages-artifact from 3 to 4

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

---
updated-dependencies:
- dependency-name: actions/upload-pages-artifact
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/docs.yaml

@@ -56,7 +56,7 @@ jobs:
     - name: "Setup Pages"
       uses: "actions/configure-pages@v5"
     - name: "Upload artifact"
-      uses: "actions/upload-pages-artifact@v3"
+      uses: "actions/upload-pages-artifact@v4"
       with:
         path: "./book/html"
     - if: "github.event_name != 'pull_request'"