build(deps): bump aiohttp from 3.9.3 to 3.9.4 in /dask-gateway #838

Job	Run time
Test hadoop backend	2m 20s
Test k8s backend & chart (v1.25, separate-namespace)	1m 39s
Test k8s backend & chart (v1.26, default, 2022.4.0)	2m 25s
Test pbs backend	1m 49s
main-tests (3.9, 1.20)	2m 32s
Test k8s backend & chart (v1.27, default)	1m 46s
Test slurm backend	1m 48s
main-tests (3.10, 1.21)	2m 30s
Test k8s backend & chart (v1.28, default)	1m 40s
main-tests (3.11, 1.21)	2m 20s
Test k8s backend & chart (v1.29, default)	1m 39s
main-tests (3.12, 1.21)	2m 28s
	24m 56s

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