[gnome-build-meta] world: Switch default branch for Polari

[Jordan Petridis <jpetridis src gnome org>]

commit 3fb82ceeb0cff4a11fac802424a950075b7e22a8
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Jul 14 00:13:48 2021 +0200

    world: Switch default branch for Polari
    
    Development happens on "main" now.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-build-meta/-/merge_requests/1201>

 elements/world/polari.bst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/elements/world/polari.bst b/elements/world/polari.bst
index 1fb67252..2dd4af23 100644
--- a/elements/world/polari.bst
+++ b/elements/world/polari.bst
@@ -2,7 +2,7 @@ kind: meson
 sources:
 - kind: git_tag
   url: gitlab_gnome_org:GNOME/polari.git
-  track: master
+  track: main
 
 build-depends:
 - sdk/appstream-glib.bst