Bump shadow-cljs

[thheller]

Projects created via npx create-cljs-app and up using shadow-cljs version 2.10.22, which at this point is rather outdated. In addition it also fails to run with the latest cider-nrepl dependency since that seems to expect a newer nrepl version than the one shipped with 2.10.22.

2.18.0 is current and it might be useful to just run npm install shadow-cljs in the generated project to always get the latest. Rather than a fixed version.