Escape env vars in workflows (#673)

Author: cdce8p

.github/workflows/ci.yaml

@@ -9,7 +9,7 @@ on:
 
 env:
   CACHE_VERSION: 1
-  DEFAULT_PYTHON: 3.9
+  DEFAULT_PYTHON: "3.9"
   LIB_FOLDER: python_typing_update
   PRE_COMMIT_CACHE: ~/.cache/pre-commit
 

.github/workflows/release.yaml

@@ -6,7 +6,7 @@ on:
       - published
 
 env:
-  DEFAULT_PYTHON: 3.13
+  DEFAULT_PYTHON: "3.13"
 
 jobs:
   release-pypi: