[gnome-usage] flatpak: Use the tracker-2.3 branch for Tracker

[Adrien Plazas <aplazas src gnome org>]

commit 6f26178373a841e9a94d98e3ef5bda6bdfd18268
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Jun 21 09:38:10 2020 +0200

    flatpak: Use the tracker-2.3 branch for Tracker
    
    This makes it build again as Tracker's master branch contains the
    development version of Tracker 3.

 org.gnome.Usage.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.Usage.json b/org.gnome.Usage.json
index e5d3a8a..4265097 100644
--- a/org.gnome.Usage.json
+++ b/org.gnome.Usage.json
@@ -43,6 +43,7 @@
             "sources": [
                 {
                     "type": "git",
+                    "branch": "tracker-2.3",
                     "url": "https://gitlab.gnome.org/GNOME/tracker.git";
                 }
             ]