Prevent warning during deps.edn jack-in

[bpringe]

The warning: WARNING: Implicit use of clojure.main with options is deprecated, use -M

It seems we can remove this just by adding -M to the jack-in command. I tested with this command:

clojure -Sdeps '{:deps {nrepl/nrepl {:mvn/version,"0.8.3"},cider/cider-nrepl {:mvn/version,"0.26.0"}}}' -M -m nrepl.cmdline --middleware "[cider.nrepl/cider-middleware]"

[bpringe]

Further discussion is here: #826.

@PEZ Should we close this as a duplicate?

[PEZ]

This one is more visible. Let's close'em together with the fix. =)