PYTHON-4494 - AsyncMongoClient._cleanup_cursor needs to be synchronous #504

Job	Run time
Make SDist	33s
Build wheels for manylinux_x86_64	2m 0s
Build wheels for manylinux_aarch64	8m 59s
Build wheels for manylinux_ppc64le	8m 9s
Build wheels for manylinux_s390x	8m 54s
Build wheels for manylinux_i686	2m 12s
Build wheels for win_amd6	3m 51s
Build wheels for win32	5m 13s
Build wheels for macos	2m 16s
Download Wheels	16s
publish	0s
	42m 23s

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