Upgrade actions/upload-pages-artifact to v3

Author: lampajr

.github/workflows/gh-pages.yml

@@ -54,7 +54,7 @@ jobs:
             --minify \
             --baseURL "${{ steps.pages.outputs.base_url }}/"
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: ./docs/site/public