[gtk/macos-ci] Pull in gdk-pixbuf fixes

[Matthias Clasen <matthiasc src gnome org>]

commit cc6c1ae7795a531aff421992936ce010b64769b1
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 3 19:15:34 2021 -0500

    Pull in gdk-pixbuf fixes

 subprojects/gdk-pixbuf.wrap | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/subprojects/gdk-pixbuf.wrap b/subprojects/gdk-pixbuf.wrap
index 123ea163f9..e0a46d61bb 100644
--- a/subprojects/gdk-pixbuf.wrap
+++ b/subprojects/gdk-pixbuf.wrap
@@ -2,5 +2,5 @@
 directory=gdk-pixbuf
 url=https://gitlab.gnome.org/GNOME/gdk-pixbuf.git
 push-url=ssh://git gitlab gnome org:GNOME/gdk-pixbuf.git
-revision=master
+revision=macos-ci
 depth=1