Update tested k8s versions to roughly match latest supported releases

[SgtCoDFish]

See cert-manager/website#1563 for the latest changes.

This doesn't add testing for k8s 1.31 against cert-manager 1.15, 1.14 or 1.12

• For 1.15, futher changes are needed in upstream cert-manager to enable testing 1.31
• For 1.14, it'll be EOL in a couple of weeks so we'll probably just ignore 1.31 there.
• For 1.12, see the comment I wrote; I don't want to tackle testing both 1.22 and 1.31 in this PR (maybe we won't ever tackle it)

[inteon]

/approve
/lgtm

[cert-manager-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inteon

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [inteon]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[cert-manager-prow]

@SgtCoDFish: Updated the job-config configmap in namespace default at cluster default using the following files:

• key cert-manager-master.yaml using file config/jobs/cert-manager/cert-manager/master/cert-manager-master.yaml

In response to this:

See cert-manager/website#1563 for the latest changes.

This doesn't add testing for k8s 1.31 against cert-manager 1.15, 1.14 or 1.12

• For 1.15, futher changes are needed in upstream cert-manager to enable testing 1.31
• For 1.14, it'll be EOL in a couple of weeks so we'll probably just ignore 1.31 there.
• For 1.12, see the comment I wrote; I don't want to tackle testing both 1.22 and 1.31 in this PR (maybe we won't ever tackle it)

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.