This PR was merged into the 3.4 branch.Discussion----------[Intl] Update the ICU data to 64.2| Q             | A| ------------- | ---| Branch?       | 3.4| Bug fix?      |no| New feature?  | no| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes, including intl-data group| Fixed tickets | -| License       | MIT| Doc PR        | -It didn't take long for the ICU team to release a new version.From their [changelog](http://site.icu-project.org/download/64#TOC-ICU4C-Download), 64.2 provides bug fixes and:* Draft Unicode 12.1 data integration* Updated locale data imported from CLDR 35.1* Support for the new Japanese era "Reiwa" (令和).Commits-------9aa2349 [Intl] Update the ICU data to 64.2

…country mapping (ro0NL)This PR was squashed before being merged into the 4.3-dev branch (closes#31262).Discussion----------[Intl] Update timezones to ICU 64.2 + compile zone to country mapping| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      | no| New feature?  | yes| BC breaks?    | no     <!-- seehttps://symfony.com/bc -->| Deprecations? | no| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->| Fixed tickets | #...   <!-- #-prefixed issue number(s), if any -->| License       | MIT| Doc PR        | symfony/symfony-docs#... <!-- required for new features -->This PR compiles the zone to country mapping (and vice versa) from ICU data:https://github.com/unicode-org/icu/blob/master/icu4c/source/data/misc/windowsZones.txtI've recompiled timezones on master due#31162, i should do it once more when it's merged upstream.Having this data allows compatibility between PHP timezones and ICU;-https://www.php.net/manual/en/intltimezone.getregion.php-https://www.php.net/manual/en/class.datetimezone.php#datetimezone.constants.per-countryFor the timezone validator in Symfony, this would be required to have a compatible "regions" option, once it supports ICU as well (#28836 (comment))Commits-------3018a7a [Intl] Update timezones to ICU 64.2 + compile zone to country mapping