Remove upper bound for base-unicode-symbols, closes #4156

Author: alexeyzab

build-constraints.yaml

@@ -3866,9 +3866,6 @@ packages:
         # https://github.com/commercialhaskell/stackage/issues/4131
         - http-api-data < 0.4
 
-        # https://github.com/commercialhaskell/stackage/issues/4156
-        - base-unicode-symbols < 0.2.3
-
         # https://github.com/commercialhaskell/stackage/issues/4167
         - protocol-buffers < 2.4.12
         - protocol-buffers-descriptor < 2.4.12