Release notes 1.16.1

[wallrj]

Preview: https://deploy-preview-1584--cert-manager.netlify.app/docs/releases/release-notes/release-notes-1.16#v1161

Release notes generated using the following command from the release process documentation:

export RELEASE_VERSION="v1.16.1"
export START_TAG="v1.16.0"
export END_REV="release-1.16"
export BRANCH="release-1.16"

export START_SHA="$(git rev-list --reverse --ancestry-path $(git merge-base $START_TAG $BRANCH)..$BRANCH | head -1)"

release-notes \
  --debug \
   --repo-path cert-manager  \
   --org cert-manager \
   --repo cert-manager  \
   --required-author "cert-manager-prow[bot]"  \
   --markdown-links=true  \
   --output github-release-description.md

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[inteon]

Can we maybe clearly state that these changes are on top of the changes in v1.16.0?
Like the original ## Changes since v1.15.0 header.

[inteon]

/approve
/lgtm

[cert-manager-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inteon

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