PYTHON-4575 Allow valid SRV hostnames with less than 3 parts #1997

Job	Run time
Make SDist	42s
Build wheels for manylinux_x86_64	2m 38s
Build wheels for manylinux_aarch64	11m 9s
Build wheels for manylinux_ppc64le	10m 58s
Build wheels for manylinux_s390x	11m 25s
Build wheels for manylinux_i686	3m 18s
Build wheels for win_amd6	3m 35s
Build wheels for win32	4m 39s
Build wheels for macos	3m 55s
Download Wheels	10s
	52m 29s

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