Log Message:
unicode-emoji: update to 15.0.

Upstream changes:

15.0:
 https://blog.unicode.org/2022/09/announcing-unicode-standard-version-150.html
 https://unicode.org/emoji/charts-15.0/emoji-released.html

 The following emoji characters and sequences have been added to this
 version of Unicode Emoji. Platforms are included where images have
 been made available (however, the images may be development versions).
 The skin-tone variants are not shown, but are listed in the counts at
 the end.