[third-party] update simdutf to v7.7.0 Updates simdutf to enable usage of utf8_length_from_utf16_with_replacement which will speed up utf8Length in v8. Change-Id: Id382f0f3412db22127548f863cf65abbe25da530 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7199521 Commit-Queue: Leszek Swirski <[email protected]> Reviewed-by: Leszek Swirski <[email protected]> Reviewed-by: Takashi Toyoshima <[email protected]> Cr-Commit-Position: refs/heads/main@{#1551013} NOKEYCHECK=True GitOrigin-RevId: 2194db5afdb7f8ca37483a63afdfdc2f1c97ddf7