Rollup merge of #114193 - crlf0710:lexer_unicode15, r=Manishearth

Update lexer emoji diagnostics to Unicode 15.0

This replaces the `unic-emoji-char` dep tree (which hasn't been updated for a while) with `unicode-properties` crate which contains Unicode 15.0 data.

Improves diagnostics for added emoji characters in recent years. (See tests).

cc #101840

cc ``@Manishearth``

Author: matthiaskrgr