PYTHON-4575 Allow valid SRV hostnames with less than 3 parts #2028

Job	Run time
Build wheels for manylinux_x86_64	2m 36s
Build wheels for manylinux_aarch64	11m 44s
Build wheels for manylinux_ppc64le	10m 51s
Make SDist	37s
Build wheels for manylinux_s390x	11m 49s
Build wheels for manylinux_i686	2m 35s
Build wheels for win_amd6	5m 31s
Build wheels for win32	6m 28s
Build wheels for macos	4m 14s
Download Wheels	9s
	56m 34s

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