Update to 21.3.0

Upstream has changed their release number, but I don't think that will affect
us at all. It appears to follow year.month

I have sent some newly added patches upstream
(https://github.com/librenms/librenms/pull/12647) and they will be removed
from here on the next release.

This update jumps over 21.20, 21.1.0, & 17.0.1 for no reason.

While here, include a patch from an outstanding PR

PR: 252640
Submitted by: geoffroy desvernay <dgeo@centrale-marseille.fr>