Release cert-manager 1.16

[wallrj]

Preview: https://deploy-preview-1520--cert-manager.netlify.app/

Not to be merged until cert-manager 1.16.0 is released and when all the cert-manager 1.16 release notes have been merged to the release-next branch.

/hold

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[wallrj]

Merging now.

/approve /lgtm

[cert-manager-prow[bot]]

@wallrj: you cannot LGTM your own PR.

In response to [this](https://github.com/cert-manager/website/pull/1520#issuecomment-2391636825): >Merging now. > >/approve >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[cert-manager-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wallrj

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](https://github.com/cert-manager/website/blob/master/OWNERS)~~ [wallrj] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[wallrj]

/unhold