PYTHON-4575 Allow valid SRV hostnames with less than 3 parts #2043

Job	Run time
Make SDist	38s
Build wheels for manylinux_x86_64	2m 23s
Build wheels for manylinux_aarch64	11m 40s
Build wheels for manylinux_ppc64le	10m 50s
Build wheels for manylinux_s390x	11m 21s
Build wheels for manylinux_i686	2m 20s
Build wheels for win_amd6	6m 8s
Build wheels for win32	5m 32s
Build wheels for macos	3m 9s
Download Wheels	8s
	54m 9s

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