Fix windows prepare job

.gitlab-ci.yml

@@ -230,7 +230,7 @@ redhat-build:
   # Obviously Windows does not use same executable name as linux...
   after_script:
     # need to setup path to be able to use python
-    - . "CI\setup_python.ps1" x64
+    - .\CI\setup_python.ps1 x64
     - python -u CI/cdash_handler.py
 
 # - Win10