Update ICU to ICU 71-1

Size Impact:
Android   +48.3K
Cast      +41.3K
ChromeOS  +64K
Common    +48.8K
flutter   208 bytes
iOS       +64.1K
https://docs.google.com/document/d/1m3UPw1kV_wazS7TRZ5K5PctJvJByY-laJO9s3vqqWQU/edit
Bug: 1313975
Change-Id: Iac9842c03b7986100d0db77d0e07e13d6285c61c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/3572176
Reviewed-by: Frank Tang <ftang@chromium.org>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/3579992
608 files changed