✨ (go/v4): Follow cert-manager org name changes

[zchee]

The cert-manager project has been transferred to the cert-manager organization from the jetstack.

Fix the certmanagerURLTmpl value to follow them.

[k8s-ci-robot]

Hi @zchee. Thanks for your PR.

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[camilamacedo86]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, zchee

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[camilamacedo86]

@zchee

Thank you a lot for your contribution 🥇