cider-repl-set-ns can fail to work in cljs repl when cider-repl-require-ns-on-set is t

[tomdl89]

Expected behavior

cider-repl-set-ns sets the ns in cljs repl when cider-repl-require-ns-on-set is t

Actual behavior

cider-repl-set-ns sets the ns in cljs repl only when cider-repl-require-ns-on-set is nil

Steps to reproduce the problem

set cider-repl-require-ns-on-set to t and try to do cider-repl-set-ns in cljs buffer or repl

Environment & Version information

clj & cljs project in Emacs 27

CIDER version information

Master

thheller noted that require and in-ns are speical forms in cljs, so can't be wrapped in do (as they are in the current code)