Merge pull request #8530 from chaen/v9.1_fix_pyyaml_deps

fix: proper case for conda deps

Author: chrisburr

environment.yml

@@ -97,7 +97,7 @@ dependencies:
   - types-cachetools
   - types-python-dateutil
   - types-pytz
-  - types-PyYAML
+  - types-pyyaml
   - types-requests
   - types-setuptools
   - pip: