reminder to distributors/packagers

[Damien Miller]

Hi,

This is just a reminder to packagers or distributors of OpenSSH that we
maintain stable branches for each release, e.g. V_8_9 for the most
recent.

We generally cherry-pick bug fixes for high-impact bugs or that are low
risk to stability.

If you are packaging OpenSSH for (say) an OS distrubution, then please
consider following this branch.

In the case of openssh-8.9, there is already a handful of fixes there.

-d