ci: bump actions/upload-pages-artifact in /.github/actions/build-docs

Bumps [actions/upload-pages-artifact](https://github.com/actions/upload-pages-artifact) from 3 to 5.
- [Release notes](https://github.com/actions/upload-pages-artifact/releases)
- [Commits](https://github.com/actions/upload-pages-artifact/compare/v3...v5)

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

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit 201960ae64)

.github/actions/build-docs/action.yml

@@ -71,7 +71,7 @@ runs:
     - name: Upload artifact
       id: upload
       if: inputs.artifact-name
-      uses: actions/upload-pages-artifact@v3
+      uses: actions/upload-pages-artifact@v5
       with:
         path: ${{ steps.out-dir.outputs.out }}
         name: ${{ inputs.artifact-name }}