bump actions/upload-pages-artifact to @v4

Author: dskvr

.github/workflows/deploy.yaml

@@ -42,7 +42,7 @@ jobs:
         uses: actions/configure-pages@v3
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v4
         with:
           name: 'github-pages'
           retention-days: 1