Remove xfail mark from cuDF empty dataframe test (#154)

Empty cuDF dataframe serialization was fixed in rapidsai/cudf#14705 .

Closes #149 .

Authors:
  - Peter Andreas Entschev (https://github.com/pentschev)

Approvers:
  - Lawrence Mitchell (https://github.com/wence-)

URL: #154

python/distributed-ucxx/distributed_ucxx/tests/test_ucxx.py

@@ -180,12 +180,7 @@ async def test_ucxx_deserialize(ucxx_loop):
     [
         lambda cudf: cudf.Series([1, 2, 3]),
         lambda cudf: cudf.Series([], dtype=object),
-        pytest.param(
-            lambda cudf: cudf.DataFrame([], dtype=object),
-            marks=pytest.mark.xfail(
-                reason="https://github.com/rapidsai/ucxx/issues/149"
-            ),
-        ),
+        lambda cudf: cudf.DataFrame([], dtype=object),
         lambda cudf: cudf.DataFrame([1]).head(0),
         lambda cudf: cudf.DataFrame([1.0]).head(0),
         lambda cudf: cudf.DataFrame({"a": []}),