haskell-ghc-syb-utils: force update to latest version

We need 0.2.3.2 to build successfully. LTS 8.x will catch up, eventually, but
until then we force the update.

Closes https://github.com/NixOS/nixpkgs/issues/26689.

pkgs/development/haskell-modules/configuration-hackage2nix.yaml

@@ -740,7 +740,7 @@ default-package-overrides:
   - ghc-mod ==5.7.0.0
   - ghc-paths ==0.1.0.9
   - ghc-prof ==1.3.0.2
-  - ghc-syb-utils ==0.2.3.1
+  - ghc-syb-utils < 0.3
   - ghc-tcplugins-extra ==0.2
   - ghc-typelits-extra ==0.2.3
   - ghc-typelits-knownnat ==0.2.4