Bump nrepl to 1.3.1 and cider-nrepl to 0.51.0

[alexander-yakushev]

I think some documentation can be reworked too mentioning that certain jump-to and javadoc parsing will now work for certain classes without enrich. But we can do it later once other people confirm it works.

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• You've updated the changelog (if adding/changing user-visible functionality)

[bbatsov]

I think some documentation can be reworked too mentioning that certain jump-to and javadoc parsing will now work for certain classes without enrich. But we can do it later once other people confirm it works.

Fine by me.