Update ICU to 71.1

[Kirill A. Korinsky]

Hey,

For last days I've had worked to update ICU to the last version.

All my tests had passed and I'd like to point that my PR is ready to be merged: https://github.com/macports/macports-ports/pull/15987 <https://github.com/macports/macports-ports/pull/15987>

--
wbr, Kirill

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