[py] Update readthedocs job config to generate api.rst

Author: cgoldberg

py/docs/.readthedocs.yaml

@@ -10,10 +10,11 @@ version: 2
 build:
   os: ubuntu-24.04
   tools:
-    python: "3.11"
+    python: "3.12"
   commands:
     - pip install -r py/docs/requirements.txt
     - pip install -r py/requirements.txt
+    - PYTHONPATH=py python3 py/generate_api_module_listing.py
     - PYTHONPATH=py sphinx-autogen -o $READTHEDOCS_OUTPUT/html py/docs/source/api.rst
     - PYTHONPATH=py sphinx-build -b html -d build/docs/doctrees py/docs/source $READTHEDOCS_OUTPUT/html