[releng] 1.33: Update kubekins-e2e variants.yaml with 1.33 config

[jimangel]

Update kubekins-e2e variant with 1.33 config.

/sig release
/area release-eng
/hold

cc @kubernetes/release-engineering @mbianchidev

[dims]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, jimangel

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[jimangel]

/unhold

edit: now that 1.33 branch is created (after complete rc release)

[jimangel]

Ref: kubernetes/sig-release#2755

[BenTheElder]

follow up: #34672

we probably need to add a step to handle this automatically, we necessarily have to bump to the latest images to get the new branch if we only recently added it to variants, but we also don't necessarily want to aggressively bump the other branches to the latest builds

[BenTheElder]

#34675 to track mitigation options for 1.34