Upgrade artifact actions to v3

Author: socketopp

.github/workflows/deploy.yml

@@ -34,7 +34,7 @@ jobs:
           touch build/.nojekyll
 
       - name: Upload Artifacts
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           # this should match the `pages` option in your adapter-static options
           path: 'build/'