python310Packages.kombu: Drop faulty version specifier in requirements

> Executing setuptoolsBuildPhase
> /nix/store/9z2cm958bxarf7n5i48czm7p7lwf9s58-python3.10-setuptools-67.4.0/lib/python3.10/site-packages/setuptools/config/setupcfg.py:520: SetuptoolsDeprecationWarning: The license_file parameter is deprecated, use license_files instead.
> warnings.warn(msg, warning_class)
> error in kombu setup command: 'tests_require' must be a string or list of strings containing valid project/version requirement specifiers; Expected end or semicolon (after name and no valid version specifier)
> pytz>dev
> ^

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

···
     hash = "sha256-N87j7nJflOqLsXPqq3wXYCA+pTu+uuImMoYA+dJ5lhA=";
   };
 
+  postPatch = ''
+    substituteInPlace requirements/test.txt \
+      --replace "pytz>dev" "pytz"
+  '';
+
   propagatedBuildInputs = [
     amqp
     vine