allow vty-6.6, allow vty-unix-0.3: closes #8042

Author: juhp

build-constraints.yaml

@@ -7856,10 +7856,6 @@ packages:
         - dataframe-th < 1.0.1.2
         - dataframe-viz < 1.0.3
 
-        # https://github.com/commercialhaskell/stackage/issues/8042
-        - vty < 6.6
-        - vty-unix < 0.3
-
         # https://github.com/commercialhaskell/stackage/issues/8049
         - apecs < 0.10