PYTHON-4575 Allow valid SRV hostnames with less than 3 parts #2056

Job	Run time
Build wheels for manylinux_x86_64	2m 9s
Build wheels for manylinux_aarch64	11m 13s
Build wheels for manylinux_ppc64le	11m 8s
Make SDist	29s
Build wheels for manylinux_s390x	11m 28s
Build wheels for manylinux_i686	2m 26s
Build wheels for win_amd6	4m 58s
Build wheels for win32	6m 44s
Build wheels for macos	3m 27s
Download Wheels	5s
	54m 7s

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