Update ICU to 73.1

[Kirill A. Korinsky]

Hey folks,

I plan to create a PR to update ICU to 73.1 in two weeks: 9th may.

It will include revdump of all affected ports, but I won't plan to test that all of them is compiled, instead I'd like to ask you to install icu-devel port which allows to track mainstream version of icu for your ports.

Thanks!

--
wbr, Kirill

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