This update for timezone fixes the following issues:

- timezone update 2020f (bsc#1177460)
* 'make rearguard_tarballs' no longer generates a bad rearguard.zi,
fixing a 2020e bug.

- timezone update 2020e (bsc#1177460)
* Volgograd switches to Moscow time on 2020-12-27 at 02:00.

- timezone update 2020f (bsc#1177460)
* 'make rearguard_tarballs' no longer generates a bad rearguard.zi,
fixing a 2020e bug.

- timezone update 2020e (bsc#1177460)
* Volgograd switches to Moscow time on 2020-12-27 at 02:00.

This update was imported from the SUSE:SLE-15:Update update project.