Add express

... and remove constraints for "speculate" and "extrapolate", fixing #4754.

build-constraints.yaml

@@ -2274,6 +2274,7 @@ packages:
         - leancheck
         - leancheck-instances
         - fitspec
+        - express
         - speculate
         - extrapolate
         - percent-format
@@ -4760,10 +4761,6 @@ packages:
         - dependent-map < 0.3
         - dependent-sum-template < 0.1
 
-        # https://github.com/commercialhaskell/stackage/issues/4754
-        - extrapolate < 0.4
-        - speculate < 0.4
-
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of