📖 remove outdated warnings

[jschoone]

What this PR does / why we need it: This removes outdated warnings which say v1beta1 and v1alpha7 are not released yet.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• [ ] squashed commits
• if necessary:
  • [ ] includes documentation
  • [ ] adds unit tests

/hold

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[k8s-ci-robot]

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[mdbooth]

/ok-to-test /approve /lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mdbooth

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubernetes-sigs/cluster-api-provider-openstack/blob/main/OWNERS)~~ [mdbooth] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[mdbooth]

Thank you!

[mdbooth]

/hold cancel