Bump python version for setup-python action (#1741)

Author: adelinowona

.github/workflows/json-regenerate-check.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v1
         with:
-          python-version: 3.7
+          python-version: 3.9
       - name: Set up npm
         uses: actions/setup-node@v1
         with: