[cert-manager] Upgrade to v1.12.6

[chansuke]

What type of PR is this?

/kind feature

What this PR does / why we need it:

[cert-manager] Upgrade to v1.12.6

ref: #10500 (review)

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[cert-manager] Upgrade to v1.12.6

[k8s-ci-robot]

Hi @chansuke. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[yankay]

Thanks @chansuke
/lgtm
/ok-to-test

[floryut]

@chansuke Thank you

[mzaian]

Thanks @chansuke

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chansuke, floryut, mzaian

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