Increase Nanny close timeout for test_spilling_local_cuda_cluster (r…

…apidsai#1289)

Increase Nanny close timeout for `test_spilling_local_cuda_cluster` which didn't fail in the past but failed for the first time in latest nightly run.

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

Approvers:
   - Richard (Rick) Zamora (https://github.com/rjzamora)

dask_cuda/tests/test_proxy.py

@@ -306,6 +306,7 @@ def task(x):
         n_workers=1,
         device_memory_limit="1B",
         jit_unspill=jit_unspill,
+        worker_class=IncreasedCloseTimeoutNanny,
         asynchronous=True,
     ) as cluster:
         async with Client(cluster, asynchronous=True) as client: