Revert "tree-diff-0.4 failed to build with semialign-1.3.1 (haskellari/these#216)"

This reverts commit dcf92e4.

tree-diff-0.4.1 should build

Author: juhp

build-constraints.yaml

@@ -7850,7 +7850,6 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/8011
         - semialign < 1.4
-        - tree-diff < 0.4 # https://github.com/haskellari/these/issues/216
     # end of Stackage upper bounds
 # end of packages