PHP 8.4 Intl extension issue with IntlTimeZone::getIanaID

[eldair]

IntlTimeZone::getIanaID/intltz_get_iana_id() method(s) are not available in compiled Intl extension.

[AaronFeledy]

Fixed by #182 which moved PHP 8.3+ images to Debian Trixie (ICU 76.1). IntlTimeZone::getIanaID requires ICU 74.1+, so this is now available out of the box.