Follow recent base image updates.
What's Changed
- ci: add link to security-tracker.debian.org by @kenhys in #515
- ci: add severity column and markup links by @kenhys in #517
- Bump version to v1.19.3-2.3 by @kenhys in #526
Full Changelog: v1.19.3-2.2...v1.19.3-2.3
