[gnome-build-meta] core: Switch default branch of gnome-shell and friends

[Jordan Petridis <jpetridis src gnome org>]

commit 7f6fa36f525924fdeadec5f9305b0627c576eb5e
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Jul 19 00:18:55 2021 +0200

    core: Switch default branch of gnome-shell and friends
    
    Development happens on "main" now.

 elements/core/gnome-shell-extensions.bst | 2 +-
 elements/core/gnome-shell.bst            | 2 +-
 elements/core/mutter.bst                 | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/elements/core/gnome-shell-extensions.bst b/elements/core/gnome-shell-extensions.bst
index 4eed3b9b..16054b9b 100644
--- a/elements/core/gnome-shell-extensions.bst
+++ b/elements/core/gnome-shell-extensions.bst
@@ -2,7 +2,7 @@ kind: meson
 sources:
 - kind: git_tag
   url: gitlab_gnome_org:GNOME/gnome-shell-extensions.git
-  track: master
+  track: main
 build-depends:
 - freedesktop-sdk.bst:public-stacks/buildsystem-meson.bst
 depends:
diff --git a/elements/core/gnome-shell.bst b/elements/core/gnome-shell.bst
index accef8c9..5cecc34d 100644
--- a/elements/core/gnome-shell.bst
+++ b/elements/core/gnome-shell.bst
@@ -3,7 +3,7 @@ kind: meson
 sources:
 - kind: git_tag
   url: gitlab_gnome_org:GNOME/gnome-shell.git
-  track: master
+  track: main
   submodules:
     subprojects/gvc:
       checkout: true
diff --git a/elements/core/mutter.bst b/elements/core/mutter.bst
index 3774b9af..aee2cd70 100644
--- a/elements/core/mutter.bst
+++ b/elements/core/mutter.bst
@@ -3,7 +3,7 @@ kind: meson
 sources:
 - kind: git_tag
   url: gitlab_gnome_org:GNOME/mutter.git
-  track: master
+  track: main
 
 build-depends:
 # Need the whole thing over just the capture for the dbus interface.