[gtk/glib-main] Point the glib subproject at the main branch

[Matthias Clasen <matthiasc src gnome org>]

commit 9d79595bc01c0aecadf50fdd44c370ae31474029
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jul 16 19:07:56 2021 -0400

    Point the glib subproject at the main branch
    
    GLib has switched from master to main. Follow along.

 subprojects/glib.wrap | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/subprojects/glib.wrap b/subprojects/glib.wrap
index e2e44d565e..c785910d9f 100644
--- a/subprojects/glib.wrap
+++ b/subprojects/glib.wrap
@@ -2,5 +2,5 @@
 directory=glib
 url=https://gitlab.gnome.org/GNOME/glib.git
 push-url=ssh://git gitlab gnome org:GNOME/glib.git
-revision=master
+revision=main
 depth=1