[nodesets] Fix incorrect ocp 4.20 labels

[michburk]

The bump from crc running ocp 4.20.1 to 4.20.14 got rolled back, but the labels + nodesets were not adjusted in response. Trying to request any nodesets that used a 4-20-14 label would fail, as they don't exist. 4-20-1 labels do exist.
This patch fixes the labels + naming.

See https://softwarefactory-project.io/zuul/t/rdoproject.org/labels

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[michburk]

I just did some testing with pr #3768

Tried switching the cifmw-base-multinode-kuttl job to use centos-9-medium-crc-cloud-ocp-4-20-14-3xl and the job cifmw-multinode-kuttl got NODE_FAILURE

then added this pr as a Depends-On: and changed the job to use centos-9-medium-crc-cloud-ocp-4-20-1-3xl and cifmw-base-multinode-kuttl is progressing as expected with the crc-cloud-ocp-4-20-1-3xl label on the crc node.