CLDR-17484 Update dayPeriods.xml

[macchiati]

One small change from the ticket to minimize changes: keeping the boundary between evening and night at 9:00pm

CLDR-17484

• This PR completes the ticket.

ALLOW_MANY_COMMITS=true

[richgillam]

Thank you!

[macchiati]

Still fixing tests; don't review until they complete successfully. Should have marked as draft until the tests complete.

[macchiati]

Finally fixed the test failure, so we can merge this. (We already agreed that this was very unlikely to cause ICU problem [Although there might be unit tests that need adjustment, like I had to for CLDR]).

[richgillam]

I'm not familiar with the CLDR tests, but the changes there look plausible, and the CLDR data changes look good.

[macchiati]

@markusicu, while you were out I checked with Rich and Dragan about this one, and said it was ok. But before merging I want to check with you.

[markusicu]

thanks for checking; these changes are ok with me

[pedberg-icu]

Also discussed in ICU TC, and agreed this is OK for CLDR 77. However ICU will likely create release candidate before this is integrated (so this would go in after that, before final release)