cl-pushnew => push

Now that doom//byte-compile and doom//reload-autoloads always run in an
isolated Emacs session, there is little need to ensure idempotency of
the current session's state.

modules/lang/swift/config.el

@@ -8,7 +8,7 @@
   (add-hook 'swift-mode-hook #'flycheck-mode)
   :config
   (set! :repl 'swift-mode #'swift-mode-run-repl) ; TODO test this
-  (cl-pushnew 'swift flycheck-checkers))
+  (push 'swift flycheck-checkers))
 
 
 (def-package! company-sourcekit