icu: bump to 76.1

icu: bump to 76.1

ICU 76 updates to Unicode 16 (blog), including new characters and scripts, emoji, collation & IDNA changes, and corresponding APIs and implementations. It also updates to CLDR 46 (beta blog) locale data with new locales, significant updates to existing locales, and various additions and corrections. For example, the CLDR and Unicode default sort orders are now very nearly the same.

ICU 76 and CLDR 46 are major releases, including a new version of Unicode and major locale data improvements.

Signed-off-by: Hirokazu MORIKAWA <morikw2@gmail.com>