RFR: 8361644 : Update ICU4C to 77.1 [v2]

[Kevin Rushforth]

On Thu, 11 Sep 2025 05:37:45 GMT, Hima Bindu Meda <hmeda at openjdk.org> wrote:

>> Updated icu to v77.1. Verified build on windows, mac and linux. Sanity testing looks fine. No  issues seen.
>
> Hima Bindu Meda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   address review comments

LGTM

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Marked as reviewed by kcr (Lead).

PR Review: https://git.openjdk.org/jfx/pull/1882#pullrequestreview-3211425200