Flaky `test_scatter_compute_lose`

[gjoseph92]

Might be a recent regression:

__________________________ test_scatter_compute_lose ___________________________
c = <Client: No scheduler connected>
s = <Scheduler 'tcp://127.0.0.1:53041', workers: 0, cores: 0, tasks: 0>
a = <Worker 'tcp://127.0.0.1:53042', name: 0, status: closed, stored: 2, running: 0/1, ready: 0, comm: 0, waiting: 0>
b = <Worker 'tcp://127.0.0.1:53044', name: 1, status: closed, stored: 0, running: 0/2, ready: 0, comm: 0, waiting: 0>
@gen_cluster(client=True)
asyncdeftest_scatter_compute_lose(c, s, a, b):
        [x] = await c.scatter([[1, 2, 3, 4]], workers=a.address)
        y = c.submit(inc, 1, workers=b.address)
        z = c.submit(slowadd, x, y, delay=0.2)
await asyncio.sleep(0.1)
await a.close()
with pytest.raises(CancelledError):
>           await wait(z)
E           Failed: DID NOT RAISE <class 'concurrent.futures._base.CancelledError'>
distributed/tests/test_client.py:3942: Failed
----------------------------- Captured stderr call -----------------------------
2022-07-15 17:50:19,265 - distributed.worker - WARNING - Compute Failed
Key:       slowadd-12ea486410272c2ea75c5d36876e43d0
Function:  slowadd
args:      ([1, 2, 3, 4], 2)
kwargs:    {'delay': 0.2}
Exception: 'TypeError(\'can only concatenate list (not "int") to list\')'

https://github.com/dask/distributed/runs/7362409614?check_suite_focus=true#step:11:1271