crio: add supported versions 1.20 and 1.21 and align default with k8s version

[cristicalin]

In #7544, we added versions 1.20 and 1.21 but the defaults were not aligned with the change.

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
This PR adds the new cri-o versions to the crio_kubernetes_version_matrix dict and bumps the default cri-o version to 1.20 to align with the default kube_version.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

cri-o: bump default to 1.20 and align with kube version

[k8s-ci-robot]

Hi @cristicalin. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[floryut]

Ah thx, I changed that but while rebasing I forgot to change it back ~~
Can you remove 1.17/1.18 ?

[muzi502]

Ah thx, I changed that but while rebasing I forgot to change it back ~~
Can you remove 1.17/1.18 ?

README.md also needs to be updated 😅

https://github.com/kubernetes-sigs/kubespray/blob/master/README.md#L135

[cristicalin]

@floryut @muzi502 done, thanks for the hints

[floryut]

Ah thx, I changed that but while rebasing I forgot to change it back ~~
Can you remove 1.17/1.18 ?

README.md also needs to be updated 😅

https://github.com/kubernetes-sigs/kubespray/blob/master/README.md#L135

oh well it was late! 😅

[cristicalin]

Molecule test failure seems to be a lemon.

[LuckySB]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cristicalin, LuckySB

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[LuckySB]

/ok-to-test

[oomichi]

/lgtm