python311Packages.celery: use xdist to speed up checkPhase

Before the tests took ~110 sec, now they only take ~19 sec.
One tests seems to fail because of that but with subtests we have 30k
tests which should verify that things work regardless.

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

@@ -18,6 +18,7 @@
 , pytest-click
 , pytest-subtests
 , pytest-timeout
+, pytest-xdist
 , pytestCheckHook
 , python-dateutil
 , pythonOlder
@@ -63,6 +64,7 @@ buildPythonPackage rec {
     pytest-click
     pytest-subtests
     pytest-timeout
+    pytest-xdist
     pytestCheckHook
   ];
 
@@ -77,6 +79,10 @@ buildPythonPackage rec {
   disabledTests = [
     "msgpack"
     "test_check_privileges_no_fchown"
+    # fails with pytest-xdist
+    "test_itercapture_limit"
+    "test_stamping_headers_in_options"
+    "test_stamping_with_replace"
   ] ++ lib.optionals stdenv.isDarwin [
     # too many open files on hydra
     "test_cleanup"