Disable default stack.yaml for windows

Author: jneira

.azure/windows-stack.yml

@@ -5,8 +5,10 @@ jobs:
     vmImage: windows-2019
   strategy:
     matrix:
-      stack-def:
-        YAML_FILE: stack.yaml
+      # default stack.yaml uses ghc-8.8.2 so we can't use it for windows
+      # TODO: Enable it when it uses ghc-8.8.3
+      # stack-def:
+      #  YAML_FILE: stack.yaml
       # ghc versions 8.8.1 and 8.8.2 are not usable in windows 
       # due to https://gitlab.haskell.org/ghc/ghc/issues/17575
       stack-8.6.5: