chore(deps): update actions/upload-pages-artifact action to v4

Author: renovate[bot]

.github/workflows/gh-pages.yml

@@ -65,7 +65,7 @@ jobs:
           ../hugo-encrypt
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: ./exampleSite/public