Based on a two-way comparison between the available timezone city names in PHP 5.6.20 and PHP 8.2.0.
Lists of available timezone names have been retrieved using the PHP `timezone_identifiers_list()` function.
See: [https://3v4l.org/ro1vY/rfc#vgit.master timezone_identifiers_list() output and comparison].
Note: Both spellings of `Kiev`/`Kyiv` need to be in the list to allow it to work PHP cross-version.
* The “old” version — `Kiev` — will be used as the basis to find the localized name for the timezone dropdown lists on PHP 5.6 to 8.1.
* The corrected spelling — `Kyiv` — will be used to find the localized name on PHP 8.2 and up.
Follow-up to [50555], [54207], [54217].
Props jrf, costdev.
See #56468.
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