support Unicode 15 via utf8proc 2.8#47392
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KristofferC merged 2 commits intomasterfrom Nov 2, 2022
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Similar to #47392, support [Unicode 15.1](https://www.unicode.org/versions/Unicode15.1.0/) by bumping utf8proc to 2.9.0 (JuliaStrings/utf8proc#253). This allows us to use [118 exciting new emoji characters](https://blog.emojipedia.org/whats-new-in-unicode-15-1-and-emoji-15-1/) as identifiers, including "edible mushroom" `"\U1f344\u200d\U1f7eb"` (but still no superscript "q"). Interestingly, they also updated the [Unicode recommendations on programming-language identifiers (UAX#31)](https://www.unicode.org/reports/tr31/tr31-39.html#Mathematical_Compatibility_Notation_Profile) to finally "bless" identifiers beginning with `∂` and `∇` and/or ending with numeric sub/superscripts. They still don't recommend nearly the range of identifiers accepted by Julia, however.
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Similarly to #43443, support Unicode 15 by bumping utf8proc to 2.8.0 (which has no other significant changes).