[gnome-books/alatiera/fix-flatpak-build] flatpak: switch tracker to the 2.3 branch

[Jordan Petridis <jpetridis src gnome org>]

commit c0e4d308be97e0fc390a01d231e496035906994f
Author: Jordan Petridis <jordan centricular com>
Date:   Tue Aug 4 11:33:48 2020 +0300

    flatpak: switch tracker to the 2.3 branch
    
    Tracker branches on the main branch for 3.0 a while ago

 flatpak/org.gnome.Books.json | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/flatpak/org.gnome.Books.json b/flatpak/org.gnome.Books.json
index 46ec24db..57aa537b 100644
--- a/flatpak/org.gnome.Books.json
+++ b/flatpak/org.gnome.Books.json
@@ -114,7 +114,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/tracker.git";
+                    "url": "https://gitlab.gnome.org/GNOME/tracker.git";,
+                    "branch": "tracker-2.3"
                 }
             ]
         },
@@ -144,7 +145,8 @@
             "sources": [
                 {
                     "type": "git",
-                    "url": "https://gitlab.gnome.org/GNOME/tracker-miners.git";
+                    "url": "https://gitlab.gnome.org/GNOME/tracker-miners.git";,
+                    "branch": "tracker-miners-2.3"
                 }
             ]
         },