This update for timezone fixes the following issues:

- Update to 2026b:
    * British Columbia moved to permanent -07 on 2026-03-09. (bsc#1264965)
    * Some more overflow bugs have been fixed in zic.
- Update to 2026a:
    * Moldova has used EU transition times since 2022.
    * The "right" TZif files are no longer installed by default.
    * -DTZ_RUNTIME_LEAPS=0 disables runtime support for leap seconds.
    * TZif files are no longer limited to 50 bytes of abbreviations.
    * zic is no longer limited to 50 leap seconds.
    * Several integer overflow bugs have been fixed.
- Update to 2025c:
    * Update Baja California DST rules in 1953, 1961-1975
    * An unset TZ is no longer invalid when /etc/localtime is
      missing, and is abbreviated "UTC" not "-00". This reverts to 2024b behavior
    * tzset etc. are now more cautious about questionable TZ settings.
    * tzset etc. now treat ' ' like '_' in time zone abbreviations
    * tzfree now preserves errno, consistently with POSIX.1-2024 "free".
    * zic has new options inspired by FreeBSD.
    * multiple changes visible to developers
- Use "REDO=posix_right" to keep installing "right" TZif files.