[gnome-music] Non-fast-forward update to branch sam/tracker3-self-contained

[Sam Thursfield <sthursfield src gnome org>]

The branch 'sam/tracker3-self-contained' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  c11bd3c... flatpak: Add Tracker 3 Miners
  7f9f78a... WIP: Allow running a local Tracker instance inside the Flat

Commits added to the branch:

  4f4b8f8... Bundle Tracker 3 in the Flatpak for systems which don't hav