inkcut: prepare for python 3.11

As 'python3' is scheduled to start pointing to that somewhere in June.

The dependency on 'sip' was changed to 08a26e4579
out of caution, but it seems to work fine with the new default sip.

pkgs/applications/misc/inkcut/default.nix

@@ -1,14 +1,12 @@
 { lib
 , fetchpatch
-, python3Packages
+, python3
 , fetchFromGitHub
 , wrapQtAppsHook
 , cups
 }:
 
-with python3Packages;
-
-buildPythonApplication rec {
+python3.pkgs.buildPythonApplication rec {
   pname = "inkcut";
   version = "2.1.5";
 
@@ -48,7 +46,7 @@ buildPythonApplication rec {
 
   nativeBuildInputs = [ wrapQtAppsHook ];
 
-  propagatedBuildInputs = [
+  propagatedBuildInputs = with python3.pkgs; [
     enamlx
     twisted
     lxml

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

@@ -11,7 +11,7 @@
 , setuptools
 , setuptools-scm
 , pythonOlder
-, sip_4
+, sip
 }:
 
 buildPythonPackage rec {
@@ -43,7 +43,7 @@ buildPythonPackage rec {
     pegen
     ply
     qtpy
-    sip_4
+    sip
   ];
 
   # qt bindings cannot be found during tests