[gtk-osx] Fix zlib repo in unstable.

[John Ralls <jralls src gnome org>]

commit bc3f9ca8a9e536cfde747a96e7973e99897976c1
Author: John Ralls <jralls ceridwen us>
Date:   Tue May 3 14:51:16 2022 -0700

    Fix zlib repo in unstable.

 modulesets-unstable/gtk-osx-network.modules | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/modulesets-unstable/gtk-osx-network.modules b/modulesets-unstable/gtk-osx-network.modules
index 410cc53..70a8e9c 100644
--- a/modulesets-unstable/gtk-osx-network.modules
+++ b/modulesets-unstable/gtk-osx-network.modules
@@ -64,7 +64,7 @@
   </autotools>
 
   <cmake id="zlib">
-    <branch repo="sourceforge" version="1.2.12"
+    <branch repo="zlib" version="1.2.12"
             module="libpng/zlib-1.2.12.tar.xz"
             hash="sha256:7db46b8d7726232a621befaab4a1c870f00a90805511c0e0090441dac57def18"/>
   </cmake>