I'm curious how this will be handled.

The same way as Ubuntu 20.04 LTS, which is supported by the vendor for five years (2025):

* https://packages.ubuntu.com/focal/openssl

Or Debian 11 (bullseye), which has LTS support until 2026:

* https://packages.debian.org/bullseye/openssl

* https://en.wikipedia.org/wiki/Debian_version_history