[gobject-introspection] subprojects: Use GLib main branch

[Emmanuele Bassi <ebassi src gnome org>]

commit aeaea29087af2d0ea8fe77f3699272e5972b594d
Author: Philip Withnall <pwithnall endlessos org>
Date:   Mon Jun 7 15:07:55 2021 +0100

    subprojects: Use GLib main branch
    
    GLib upstream has renamed its `master` branch to `main`.
    
    See https://gitlab.gnome.org/GNOME/glib/-/issues/2348.
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 subprojects/glib.wrap | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/subprojects/glib.wrap b/subprojects/glib.wrap
index e4de7eed..e6065930 100644
--- a/subprojects/glib.wrap
+++ b/subprojects/glib.wrap
@@ -1,4 +1,4 @@
 [wrap-git]
 directory=glib
 url=https://gitlab.gnome.org/GNOME/glib.git
-revision=origin/master
+revision=main