python3Packages.moto: update disabled tests, drop xdist

Dropping pytest-xdist due to reproducible hangs at the end of the test
run.

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

···
 
   checkInputs = [
     freezegun
-    pytest-xdist
     pytestCheckHook
     sure
   ];
 
   pytestFlagsArray = [
-    "--numprocesses $NIX_BUILD_CORES"
-
     # Disable tests that try to access the network
     "--deselect=tests/test_cloudformation/test_cloudformation_custom_resources.py::test_create_custom_lambda_resource__verify_cfnresponse_failed"
     "--deselect=tests/test_cloudformation/test_server.py::test_cloudformation_server_get"
···
     "--deselect=tests/test_sqs/test_sqs_integration.py::test_invoke_function_from_sqs_exception"
     "--deselect=tests/test_stepfunctions/test_stepfunctions.py::test_state_machine_creation_fails_with_invalid_names"
     "--deselect=tests/test_stepfunctions/test_stepfunctions.py::test_state_machine_list_executions_with_pagination"
+    "--deselect=tests/test_iotdata/test_iotdata.py::test_update"
+    "--deselect=tests/test_iotdata/test_iotdata.py::test_basic"
+    "--deselect=tests/test_iotdata/test_iotdata.py::test_delete_field_from_device_shadow"
+    "--deselect=tests/test_iotdata/test_iotdata.py::test_publish"
+    "--deselect=tests/test_s3/test_server.py::test_s3_server_bucket_versioning"
 
     # json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
     "--deselect=tests/test_cloudformation/test_cloudformation_stack_integration.py::test_lambda_function"
+
+    # AssertionError: CloudWatch log event was not found.
+    "--deselect=tests/test_logs/test_integration.py::test_subscription_filter_applies_to_new_streams"
+
+    # KeyError: 'global'
+    "--deselect=tests/test_iotdata/test_server.py::test_iotdata_list"
+    "--deselect=tests/test_iotdata/test_server.py::test_publish"
+
+    # Blocks test execution
+    "--deselect=tests/test_utilities/test_threaded_server.py::TestThreadedMotoServer::test_load_data_from_inmemory_client"
   ];
 
   disabledTestPaths = [