python3Packages.path: rename from path.py; 12.0.1 -> 16.4.0

The project had been renamed after 12.5.0 back in 2020, which is why we
didn't receive further updates.

Created an alias and renamed all existing references.

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

@@ -1,5 +1,5 @@
 { lib, buildPythonPackage, fetchPypi
-, six, pathpy, zetup, pytest
+, six, path, zetup, pytest
 , decorator }:
 
 buildPythonPackage rec {
@@ -16,7 +16,7 @@ buildPythonPackage rec {
   '';
 
   nativeBuildInputs = [ zetup ];
-  checkInputs = [ six pathpy pytest ];
+  checkInputs = [ six path pytest ];
   propagatedBuildInputs = [ decorator ];
 
   meta = with lib; {