Update actions/upload-pages-artifact action to v5 (#123)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/pages.yml

@@ -83,7 +83,7 @@ jobs:
         run: mv signing-key _site/
 
       - name: Upload GitHub Pages Artifact
-        uses: actions/upload-pages-artifact@v4.0.0
+        uses: actions/upload-pages-artifact@v5.0.0
         with:
           path: _site