glib: 2.66.4 -> 2.66.8

rebased the schema override patch, adding the same upstream safety but
not duplicating the ability to pass multiple directories as this does
not appear to be necessary for nix overrides

pkgs/development/libraries/glib/default.nix

@@ -45,11 +45,11 @@ in
 
 stdenv.mkDerivation rec {
   pname = "glib";
-  version = "2.66.4";
+  version = "2.66.8";
 
   src = fetchurl {
     url = "mirror://gnome/sources/glib/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
-    sha256 = "l9+GcOMvn9T3OSsJgOZh3WJQEgFdWDUNoeWOND9K+YQ=";
+    sha256 = "sha256-l7yH3ZE2VYmvXLv+oldIM66nobcYQP02Xs0oUsdrnIs=";
   };
 
   patches = optionals stdenv.isDarwin [