[arch-general] version bumps on -dkms

I don't believe a version bump is required for -dkms (e.g. nvidia-dkms in [testing] just got bumped to -4 due to new kernel in [testing])? I understand this is because the nvidia packages use a split PKGBUILD, but it still seems something could be done a bit better here. Perhaps a way for split PKGBUILDs to have different pkgvers (this would cause more problems than it solves IMO) or just not pushing *-dkms automatically with everything else unless sources have changed.