python3Packages.widgetsnbextension: patch out unnecessary dependency

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

@@ -8,13 +8,20 @@
 buildPythonPackage rec {
   pname = "widgetsnbextension";
   version = "3.6.0";
+  format = "setuptools";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-6Ep6n8ubrz1XEG4YSnOJqPjrk1v3QaXrnWCqGMwCmoA=";
+    hash = "sha256-6Ep6n8ubrz1XEG4YSnOJqPjrk1v3QaXrnWCqGMwCmoA=";
   };
 
-  propagatedBuildInputs = [ notebook ];
+  # setup.py claims to require notebook, but the source doesn't have any imports
+  # in it.
+  postPatch = ''
+    substituteInPlace setup.py --replace "'notebook>=4.4.1'," ""
+  '';
+
+  propagatedBuildInputs = [ ];
 
   # No tests in archive
   doCheck = false;