Temporarily pin nox to workaround a bug in the latest version

Author: pfmoore

.github/workflows/check.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v5
-    - run: pip install nox
+    - run: pip install nox==2025.2.9
 
     - run: nox -s generate
     - name: Check regenerated scripts vs what is generated by automation.