PYTHON-4575 Allow valid SRV hostnames with less than 3 parts #2058

Job	Run time
Make SDist	35s
Build wheels for manylinux_x86_64	2m 23s
Build wheels for manylinux_aarch64	11m 28s
Build wheels for manylinux_ppc64le	11m 15s
Build wheels for manylinux_s390x	11m 34s
Build wheels for manylinux_i686	2m 30s
Build wheels for win_amd6	5m 49s
Build wheels for win32	6m 6s
Build wheels for macos	3m 35s
Download Wheels	7s
	55m 22s

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