ci: Fix Python version export from AppVeyor to Codecov

Author: QuLogic

.appveyor.yml

@@ -91,7 +91,7 @@ artifacts:
 
 on_finish:
   - micromamba install codecov
-  - codecov -e PYTHON_VERSION PLATFORM -n "$PYTHON_VERSION Windows"
+  - codecov -e PYTHON_VERSION PLATFORM -n "%PYTHON_VERSION% Windows"
 
 on_failure:
   # Generate a html for visual tests