RFR: 8361644 : Update ICU4C to 77.1

[Kevin Rushforth]

On Wed, 3 Sep 2025 11:21:24 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.

I think this can be taken out of Draft and made "rfr".

Reviewers: @kevinrushforth @tiainen

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PR Comment: https://git.openjdk.org/jfx/pull/1882#issuecomment-3262357914