plex: 1.0.0 -> 1.2.7; fix some more binaries (#20137)

This bumps the version of Plex to the new 1.2.x branch, available to the
public. During the 1.1.x branch, there were several more critical
binaries that were added to the distribution; we also have to patch
these new executables as well with the version bump, to ensure things
keep working.

Part of this patch was authored by Michael Francis - I simply bumped the
version.

Closes #20137.

Authored-by: Austin Seipp <aseipp@pobox.com>
Authored-by: Michael Francis <edude03@gmail.com>
Signed-off-by: Austin Seipp <aseipp@pobox.com>