python310Packages.aiohttp: remove pytest-xdist again and add a comment to not add it again

This reverts commit d65445f5b2.

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

@@ -25,7 +25,6 @@
 , freezegun
 , gunicorn
 , pytest-mock
-, pytest-xdist
 , pytestCheckHook
 , re-assert
 , trustme
@@ -81,12 +80,12 @@ buildPythonPackage rec {
     idna-ssl
   ];
 
+  # NOTE: pytest-xdist cannot be added because it is flaky. See https://github.com/NixOS/nixpkgs/issues/230597 for more info.
   nativeCheckInputs = [
     async_generator
     freezegun
     gunicorn
     pytest-mock
-    pytest-xdist
     pytestCheckHook
     re-assert
   ] ++ lib.optionals (!(stdenv.isDarwin && stdenv.isAarch64)) [