Update Unicode Data Files to 15.1.0

Support the Unicode Standard version 15.1.0, which was released on September 12, 2023 [1]. Deltas from the previous version are listed here [2]. Notable change is "The repertoire addition consists almost entirely of urgently needed CJK ideographs, synchronized with planned additions to the Chinese national standard, GB 18030."

[1] https://unicode.org/versions/Unicode15.1.0/
[2] https://www.unicode.org/charts/PDF/Unicode-15.1/