PYTHON-4209 Ensure that no error is raised for unknown auth mechanism #1105

Job	Run time
Make SDist	36s
Build wheels for manylinux_x86_64	2m 16s
Build wheels for manylinux_aarch64	10m 33s
Build wheels for manylinux_ppc64le	10m 23s
Build wheels for manylinux_s390x	10m 42s
Build wheels for manylinux_i686	2m 53s
Build wheels for win_amd6	4m 54s
Build wheels for win32	5m 12s
Build wheels for macos	3m 44s
Download Wheels	7s
	51m 20s

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