[tz] Update zone.tab with #KyivNotKiev

[Ігор Чигінь]

Hello,

it's almost 28 years of using city name of non-existing USSR.

I propose to use correct timezone name in zone.tab (also zone1970.tab?)
UA +5026+03031 Europe/Kyiv

More info from MFA of Ukraine:
https://mfa.gov.ua/en/page/open/id/5418

Thanks,
Ihor
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