use packaging instead of pkg_resources to parse versions

ipykernel/eventloops.py

@@ -9,7 +9,7 @@
 from functools import partial
 
 import zmq
-from pkg_resources import parse_version as V
+from packaging.version import Version as V
 from traitlets.config.application import Application
 
 

ipykernel/tests/test_message_spec.py

@@ -9,7 +9,7 @@
 
 import jupyter_client
 import pytest
-from pkg_resources import parse_version as V
+from packaging.version import Version as V
 from traitlets import (
     Bool,
     Dict,

setup.py

@@ -71,7 +71,7 @@ def run(self):
         'appnope;platform_system=="Darwin"',
         "psutil",
         "nest_asyncio",
-        "setuptools>=60",  # for pkg_resources
+        "packaging",
     ],
     extras_require={
         "test": [