PYTHON-4827 - Fix dnspython typechecking failures #819

Job	Run time
Build wheels for manylinux_x86_64	2m 31s
Make SDist	38s
Build wheels for manylinux_aarch64	10m 21s
Build wheels for manylinux_ppc64le	9m 38s
Build wheels for manylinux_s390x	10m 35s
Build wheels for manylinux_i686	2m 51s
Build wheels for win_amd6	6m 6s
Build wheels for win32	4m 28s
Build wheels for macos	3m 22s
Download Wheels	7s
	50m 37s

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