python3Packages.pytest: relax pluggy constraints

Apparently possible without further changes:
https://github.com/pytest-dev/pytest/pull/9040

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

···
     sha256 = "50bcad0a0b9c5a72c8e4e7c9855a3ad496ca6a881a3641b4260605450772c54b";
   };
 
+  postPatch = ''
+    substituteInPlace setup.cfg \
+      --replace "pluggy>=0.12,<1.0.0a1" "pluggy>=0.23,<2.0"
+  '';
+
   nativeBuildInputs = [ setuptools-scm ];
 
   propagatedBuildInputs = [