build_suggestions: bump 4.21 minimum upgrade version to 4.20.12

[haircommander]

so upgrades go through openshift/machine-config-operator#5516

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[haircommander]

context: in cri-o 1.33, a change cri-o/cri-o#8962 was made to the default limits set for CRI-O. Now, the ulimit nofile is set much lower, with space to set it higher. however, some workloads don't expect this change, and fail (see https://issues.redhat.com/browse/OCPBUGS-62095)

This was worked around temporarily in openshift/machine-config-operator#5308, but that workaround was not intendd to be carried in to 4.21.

Instead, we should drop-in an ignition file on upgrades from 4.20 to 4.21 to make sure existing clusters don't get this change, but new clusters started in 4.21 do.

Now we need to make sure upgrades go through that PR. it missed 4.20.11 by a day, so I feel confident it will land in 4.20.12

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[wking]

Does look like OCPBUGS-70201 missed 4.20.11. So we expect it to be in 4.20.12. But let's wait until 4.20.12 exists, so we can confirm for sure, because sometimes ART picks special things as the source of a release image.

[haircommander]

works for me, as long as we can get something like this in for upgrades to 4.21.0

/hold