[gnome-build-meta/matthiasc/use-gtk-main-branch] Use the main branch of gtk

[Matthias Clasen <matthiasc src gnome org>]

commit 67b9ca8faf0610ea29d859cb676ce492b28b2f09
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 29 18:21:08 2021 -0500

    Use the main branch of gtk
    
    GTK has switched from master to main.

 elements/sdk/gtk.bst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/elements/sdk/gtk.bst b/elements/sdk/gtk.bst
index 9005a929c..2b8361d5b 100644
--- a/elements/sdk/gtk.bst
+++ b/elements/sdk/gtk.bst
@@ -3,7 +3,7 @@ kind: meson
 sources:
 - kind: git_tag
   url: gitlab_gnome_org:GNOME/gtk.git
-  track: master
+  track: main
 
 build-depends:
 - sdk-deps/sassc.bst