upgrade Unicode database to 16.0.0

[benjaminp]

https://blog.unicode.org/2024/09/announcing-unicode-standard-version-160.html

Linked PRs

• gh-124016: update Unicode to 16.0.0 #124017

[terryjreedy]

Among other things, "This version adds 5,185 new characters, including 3,995 additional Egyptian Hieroglyph characters plus seven new scripts, seven new emoji characters, and over 700 symbols from legacy computing environments, for a total of 154,998 characters." and a new annex about hieroglyphs.