Update CLDR to v43

The Unicode Consortium is working on CLDR v43; alphas are already out (so we could evaluate and prepare, but there's no rush just yet). Scheduled release is 2023 April 12th.

Things to check (in ldml.py):

• "The parentLocale elements now have an optional component attribute, with a value of segmentations or collations. These should be used for inheritance for those respective elements." – this may imply a need to modify the handling of parentLocale so that we don't follow those.
• "Likely Subtags now have an attribute to indicate the origin, currently: sil1, wikidata, special." – need to check those don't cause problems; should suffice to ignore the attribute.