web-platform-tests/wpt merge_pr_46778

on GitHub

Part 5. first-letter-hi-001.html should consider Unicode 15.1.

After applying ICU4X 1.5, this test are failure. Grapheme cluster in ICU4X 1.5
uses Unicode 15.1, so some Indic language rules are different [*1].

• https://unicode.org/reports/tr29/#GB9c

Differential Revision: https://phabricator.services.mozilla.com/D213010

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1899411
gecko-commit: bd64aa85c08c49386c8367448c155c90370215ae
gecko-reviewers: jfkthame