Caution: this is probably not the best way to do this. I took a break from FreeBSD and am just getting back into it.
Do this from your "broken" install of 14.2. You may need to use an alternate console or SSH.
pkg install -y git portmaster
git clone --branch releng/14.2 https://github.com/freebsd/freebsd-src.git /usr/src
git clone --branch main https://github.com/freebsd/freebsd-ports.git /usr/ports
pkg remove drm-kmod drm-61-kmod drm-515-kmod drm-510-kmod
portmaster -f --packages-build -r drm-kmod drm-61-kmod
Hope you work now!