Fix lsp packages failing to load

As of emacs-lsp/lsp-mode@b9b0f34 there is no more lsp-clients, so load
these lsp packages after lsp-mode instead.

modules/lang/haskell/+lsp.el

@@ -1,7 +1,7 @@
 ;;; lang/haskell/+lsp.el -*- lexical-binding: t; -*-
 
 (use-package! lsp-haskell
-  :after lsp-clients
+  :after lsp-mode
   :preface (add-hook 'haskell-mode-local-vars-hook #'lsp!)
   :config
   (when IS-MAC