[bug-libunistring] Unicode 15.1.0

[Simon Josefsson]

Hi.  I noticed Unicode 15.1.0 has been released:

http://blog.unicode.org/2023/09/announcing-unicode-standard-version-151.html

I'm sure people will come along asking for libidn2 to support some of
the new characters, so an update of libunistring would be great.  Is the
process to update libunistring to a new Unicode release documented
anywhere?  I suppose some things are not mechanic, but some of the steps
are.

Thanks,
/Simon

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