fix: use dots in release tag and filename for ICU >= 78

[rubenaguadoc]

Starting from ICU 78.1, the unicode-org/icu GitHub releases reverted to using dots in both the release tag (release-78.1) and the filename (icu4c-78.1-data-bin-l.zip), instead of hyphens/underscores used in versions 69-77.

URL format by version range:

• v67-v68: release-67-1/icu4c-67.1-data-bin-l.zip (hyphens in tag, dots in file)
• v69-v77: release-73-1/icu4c-73_1-data-bin-l.zip (hyphens in tag, underscores in file)
• v78+: release-78.1/icu4c-78.1-data-bin-l.zip (dots in both)

[rubenaguadoc]

Hi @srl295, really appreciate the quick review here 🙏

Just checking if you have any timeline in mind for merging this and publishing a new release.
The issue affects npm install full-icu on Node.js 22.22.1+, so getting this fix out would unblock things on our side.

Happy to help with anything needed.

[srl295]

@nschonni it's been a while since anyone released this. Anything new i need to know?

[nschonni]

Don't think I've ever released any of the NPM packages in this org before. Quick search I found https://github.com/nodejs/undici as another project that has some automation (and CI hardening) that might make sense here.

edit: Make sense here, but not needed as part of this PR

[srl295]

Ok sounds good. I can do a manual release at some point

[rubenaguadoc]

Hi! Just checking in on this PR in case there’s anything else needed from my side — happy to help if useful 🙂

Also, do you have an approximate idea of when the manual release might happen? Just asking to get a rough idea of the timeline on my end.

Thanks again!