python3Packages.librosa: update maintainer (#415401)

pkgs/development/python-modules/librosa/default.nix

···
     homepage = "https://github.com/librosa/librosa";
     changelog = "https://github.com/librosa/librosa/releases/tag/${version}";
     license = lib.licenses.isc;
-    maintainers = with lib.maintainers; [ GuillaumeDesforges ];
+    maintainers = with lib.maintainers; [ carlthome ];
   };
 }