python: widgetsnbextension: 3.3.0 -> 3.4.0

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

···
 
 buildPythonPackage rec {
   pname = "widgetsnbextension";
-  version = "3.3.0";
+  version = "3.4.0";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "c5280a62d293735cdadc7b8884e2affcfb0488420ee09963577f042359726392";
+    sha256 = "c9d6e426a1d79d132b57b93b368feba2c66eb7b0fd34bdb901716b4b88e94497";
   };
 
   propagatedBuildInputs = [ notebook ];