[3.34] flatpak: Use tracker 2.3 version
The next release of Tracker will be a backwards-incompatible 3.0 release. Work for Tracker 3.0 has already begun in the master branch. Use the the tracker-2.3 branch to keep stability.
The next release of Tracker will be a backwards-incompatible 3.0 release. Work for Tracker 3.0 has already begun in the master branch. Use the the tracker-2.3 branch to keep stability.