hasql-1.9 no longer exports QueryError as a standalone type.
QueryError is now a constructor of SessionError, and Hasql.Session.run
returns Either SessionError.
Update the notify function signature accordingly.
--- ../src/Hasql/Notifications.hs	2026-09-12 10:21:54.745549215 +0300
+++ ../src/Hasql/Notifications.hs	2026-09-12 10:22:17.158815555 +0300
@@ -74,7 +74,7 @@
 notify :: Connection -- ^ Connection to be used to send the NOTIFY command
        -> PgIdentifier -- ^ Channel where to send the notification
        -> Text -- ^ Payload to be sent with the notification
-       -> IO (Either S.QueryError ())
+       -> IO (Either S.SessionError ())
 notify con channel mesg =
    run (sql $ T.encodeUtf8 ("NOTIFY " <> fromPgIdentifier channel <> ", '" <> mesg <> "'")) con