allow wai-app-static 3.2 (closes #7964)

Author: juhp

build-constraints.yaml

@@ -5840,7 +5840,7 @@ packages:
         - vty-crossplatform
         - vty-unix
         - wai
-        - wai-app-static < 3.2.0 # https://github.com/commercialhaskell/stackage/issues/7964
+        - wai-app-static
         - wai-conduit
         - wai-eventsource
         - wai-handler-launch