Hotload libraries using Clojure 12 onward

[practicalli-johnny]

Now Clojure 1.12 has been released, include only 1.12 examples for hotloading libraries in Practicalli custom user namespace

• remove the older add-libs reqiure code for Clojure 1.11 and earlier
• review examples for addlibs and sync-deps

Existing content

• https://practical.li/clojure/clojure-cli/repl-startup/#hotload-libraries