python312Packages.hypothesis-auto: add optional-dependencies

pkgs/development/python-modules/hypothesis-auto/default.nix

···
   hypothesis,
   poetry-core,
   pydantic,
+  pytest,
   pytestCheckHook,
   pythonOlder,
 }:
···
     hypothesis
     pydantic
   ];
+
+  optional-dependencies = {
+    pytest = [ pytest ];
+  };
 
   pythonImportsCheck = [ "hypothesis_auto" ];