[gnome-build-meta] core/calls: primary branch is now 'main'

[Jordan Petridis <jpetridis src gnome org>]

commit e1f879be73d5d2b4f17b17c04d9e222adda19801
Author: Jordan Petridis <jordan centricular com>
Date:   Fri Sep 2 04:12:38 2022 +0300

    core/calls: primary branch is now 'main'

 elements/core/calls.bst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/elements/core/calls.bst b/elements/core/calls.bst
index f058fa656..56ccc0400 100644
--- a/elements/core/calls.bst
+++ b/elements/core/calls.bst
@@ -3,7 +3,7 @@ kind: meson
 sources:
 - kind: git_tag
   url: gnome:calls.git
-  track: master
+  track: main
   submodules:
     subprojects/libcall-ui:
       checkout: true