Fix JSON validation error

See vega/altair#2794

.github/workflows/website.yml

@@ -35,6 +35,7 @@ jobs:
       - run: |
           python -m pip install --upgrade pip
           pip install -r requirements.txt
+          pip uninstall rfc3986-validator
       - name: Update analysis notebooks
         run: |
           for filename in charts_data/*.ipynb; do