python: decorator: 4.1.2 -> 4.2.1

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

···
 
 buildPythonPackage rec {
   pname = "decorator";
-  version = "4.1.2";
+  version = "4.2.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "7cb64d38cb8002971710c8899fbdfb859a23a364b7c99dab19d1f719c2ba16b5";
+    sha256 = "7d46dd9f3ea1cf5f06ee0e4e1277ae618cf48dfb10ada7c8427cd46c42702a0e";
   };
 
   meta = {