Debian DLA-2542-1 : tzdata new upstream version

This update includes the changes in tzdata 2021a. Notable changes are : - South Sudan changed from +03 to +02 on 2021-02-01. For Debian 9 stretch, this problem has been fixed in version 2021a-0+deb9u1. We recommend that you upgrade your tzdata packages. For the detailed security status of tzdata...