PYTHON-4575 Allow valid SRV hostnames with less than 3 parts #2069

Job	Run time
Make SDist	30s
Build wheels for manylinux_x86_64	2m 31s
Build wheels for manylinux_aarch64	11m 25s
Build wheels for manylinux_ppc64le	11m 13s
Build wheels for manylinux_s390x	11m 19s
Build wheels for manylinux_i686	2m 28s
Build wheels for win_amd6	6m 8s
Build wheels for win32	6m 16s
Build wheels for macos	3m 38s
Download Wheels	7s
	55m 35s

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