A tzdata new upstream version has been released for Debian GNU/Linux 9 LTS to includes the changes in tzdata 2022a.

DLA 2963-1: tzdata new upstream version

- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2963-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
March 29, 2022   https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : tzdata
Version : 2021a-0+deb9u3

This update includes the changes in tzdata 2022a. Notable
changes are:

- - Adjusted DST rules for Palestine, already in effect.

For Debian 9 stretch, this problem has been fixed in version
2021a-0+deb9u3.

We recommend that you upgrade your tzdata packages.

For the detailed security status of tzdata please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/tzdata

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS