Update `test_spill.py` to avoid `FutureWarning`s (#1243) #314

Job	Run time
checks / check-style	2m 29s
checks / other-checks	46s
wheel-build	58s
conda-python-build / compute-matrix	3s
conda-python-build / build (11.8.0, ubuntu22.04, amd64, 3.9)	4m 21s
conda-python-build / build (11.8.0, ubuntu22.04, arm64, 3.9)	3m 20s
conda-python-build / build (11.8.0, ubuntu22.04, amd64, 3.10)	4m 18s
conda-python-build / build (11.8.0, ubuntu22.04, arm64, 3.10)	3m 18s
conda-python-build / build (12.0.1, ubuntu22.04, amd64, 3.9)	4m 20s
conda-python-build / build (12.0.1, ubuntu22.04, amd64, 3.10)	4m 26s
conda-python-tests / compute-matrix	8s
docs-build / build	3m 35s
conda-python-tests / tests (11.2.2, centos7, amd64, 3.9, v100, earliest)	26m 29s
conda-python-tests / tests (11.4.3, ubuntu20.04, amd64, 3.9, v100, latest)	47m 31s
conda-python-tests / tests (11.8.0, ubuntu22.04, amd64, 3.10, v100, latest)	38m 4s
conda-python-tests / tests (11.8.0, ubuntu22.04, arm64, 3.10, a100, latest)	23m 58s
conda-python-tests / tests (12.0.1, ubuntu22.04, amd64, 3.10, v100, latest)	46m 12s
pr-builder	0s
	3h 34m 16s

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