Use ghc-8.8.3 for macos-installhs-cabal

Author: jneira

.azure/macos-installhs-cabal.yml

@@ -21,8 +21,7 @@ jobs:
     displayName: "Unpack cache"
     condition: eq(variables.CACHE_RESTORED, 'true')
   - bash: |
-      # TODO Install ghc-8.8.3 when adding stack-8.8.3.yaml 
-      brew install [email protected]
+      brew install [email protected]
       brew install cabal-install --ignore-dependencies ghc
       which cabal
       which ghc