PYTHON-5116 - Add MongoDB 4.2 back to our tested versions #1620

Job	Run time
Build wheels for manylinux_x86_64	2m 33s
Build wheels for manylinux_aarch64	11m 46s
Build wheels for manylinux_ppc64le	11m 46s
Build wheels for manylinux_s390x	11m 32s
Build wheels for manylinux_i686	2m 22s
Make SDist	29s
Build wheels for win_amd6	5m 12s
Build wheels for win32	5m 58s
Build wheels for macos	4m 18s
Download Wheels	5s
	56m 1s

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