Needs approval from an approver in each of these files:
- ~~[OWNERS](https://github.com/cert-manager/release/blob/master/OWNERS)~~ [SgtCoDFish,irbekrm]
Approvers can indicate their approval by writing `/approve` in a comment
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Now that https://github.com/cert-manager/cert-manager/pull/5646 is merged, we can default to testing using k8s 1.26 on master
After this merges, we can merge https://github.com/jetstack/testing/pull/779 which applies these changes.