`test_ucx_unreachable` failed on gpuCI

We got a gpuCI failure on https://github.com/dask/distributed/pull/6423. I'm pretty convinced this is unrelated

https://gpuci.gpuopenanalytics.com/job/dask/job/distributed/job/prb/job/distributed-prb/3200/CUDA_VER=11.5,LINUX_VER=ubuntu18.04,PYTHON_VER=3.9,RAPIDS_VER=22.06/testReport/junit/distributed.comm.tests/test_ucx/test_ucx_unreachable/

cc @dask/gpu 