openshift: Bump base images to 4.12, Go 1.18

[pierreprinetti]

Upgrade base images to be consistent with go.mod and OpenShift 4.12.

[openshift-ci]

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[pierreprinetti]

No this definitely should not merge before we cut 4.11.
/close

[openshift-ci]

@pierreprinetti: Closed this PR.

In response to this:

No this definitely should not merge before we cut 4.11.
/close

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