Add URL comments to get latest commits for pinning.

Author: auouymous

pins.sh

@@ -1,5 +1,7 @@
+# https://gitlab.gnome.org/GNOME/gtk-osx/-/commits/master
 # use latest commit (2023-08-20)
 PIN_GTK_OSX_COMMIT='a27e8ff6'
 
+# https://gitlab.gnome.org/GNOME/gtk-mac-bundler/-/commits/master
 # use latest commit (2023-08-17)
 PIN_GTK_MAC_BUNDLER_COMMIT='0a95b2d5'