chore(actions): update actions/upload-pages-artifact action to v2 (#22)

Author: renovate[bot]

.github/workflows/publish-website.yaml

@@ -79,7 +79,7 @@ jobs:
           --baseURL "${{ steps.pages.outputs.base_url }}/"            
 
     - name: Upload artifact
-      uses: actions/upload-pages-artifact@v1
+      uses: actions/upload-pages-artifact@v2
       with:
         path: website/public