Restrict base-compat (#7927).

Author: alaendle

build-constraints.yaml

@@ -7888,6 +7888,10 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/7926
         - transformers-compat < 0.8
+
+        # https://github.com/commercialhaskell/stackage/issues/7927
+        - base-compat < 0.15.0
+        - base-compat-batteries < 0.15.0
     # end of Stackage upper bounds
 # end of packages