A postgis regression update has been released for Debian GNU/Linux 9 LTS to address a regression introduced by the previous update.

DLA 2857-2: postgis regression update

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Debian LTS Advisory DLA-2857-2 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
December 29, 2021   https://wiki.debian.org/LTS
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Package : postgis
Version : 2.3.1+dfsg-2+deb9u2

The regression of postgresql-9.6-postgis-2.3-scripts being empty in
2.3.1+dfsg-2+deb9u1 has been fixed.

For Debian 9 stretch, this problem has been fixed in version
2.3.1+dfsg-2+deb9u2.

We recommend that you upgrade your postgis packages.

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

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