It won't. There's nothing to "upgrade" to. Package remains the same, same version, same code. Package name changes are recorded in /usr/ports/MOVED, which the package builders use for input. Then get recorded in the packages themselves. There's rarely anything manual that needs to be done, it typically just picks up those changes automagically. But we'll find out soon enough whether that's the case or not.
But in this specific commit, MOVED is not used, as the change is in version string.
I've looked into the changes a bit closely, and it is not enough for kmod issues.
As the name of pkg including version is, for example (stable/14),
before : drm-61-kmod-6.1.92_3
after : drm-61-kmod-6.1.92.1402501_3
This is because MOVED is untouched in this case, and means, pkgs for multiple releases (14.1, 14.2 and so on) cannot coexist in the same repository.
Why? Because if (to make it simpler, does not match current state)
drm-61-kmod-6.1.92.1401001_3 (for 14.1)
and
drm-61-kmod-6.1.92.1402001_3 (for 14.2)
coexists, the latter should be preferred even for 14.1 as its calcurated version is bigger, means, newer.
To support the coexistense,
pkg(8) should be updated not to consider OSVERSION string (1401001, 1402001, 1402501,...) as the version of pkg file (detect and skip is needed).
Another option would be to expand architecture string of pkg from current
FreeBSD:14:amd64 (for all 14.*, amd64)
to something like
FreeBSD:1402:amd64 (specific to 14.2, amd64)
or
FreeBSD:1402001:amd64
for kmod ports. Or separate repository for kmod pkgs per-point-release.