chore(deps): bump actions/upload-pages-artifact from 3 to 4 (operator-framework#2908)

Author: dependabot[bot]

.github/workflows/hugo.yaml

@@ -68,7 +68,7 @@ jobs:
             --minify \
             --baseURL "${{ steps.pages.outputs.base_url }}/"
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: ./docs/public