fix async test werkzeug version check

Author: T4rk1n

tests/async_tests/test_async_callbacks.py

@@ -5,7 +5,6 @@
 import pytest
 
 import numpy as np
-import werkzeug
 
 from dash_test_components import (
     AsyncComponent,
@@ -316,11 +315,6 @@ async def set_out(opts):
             dash_duo.select_dcc_dropdown("#dd", f"opt{i}")
 
 
-@pytest.mark.xfail(
-    condition=werkzeug.__version__ in ("2.1.0", "2.1.1"),
-    reason="Bug with 204 and Transfer-Encoding",
-    strict=False,
-)
 @pytest.mark.parametrize("refresh", [False, True])
 def test_async_cbsc007_parallel_updates(refresh, dash_duo):
     # This is a funny case, that seems to mostly happen with dcc.Location