[release-1.8] 🌱 Bump cert-manager to v1.16.3

[troy0820]

Cherry-pick #11699
/area clusterctl

[k8s-ci-robot]

@troy0820: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-apidiff-release-1-8	b745b0b	link	false	/test pull-cluster-api-apidiff-release-1-8

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[fabriziopandini]

/hold to after today's patch release

[sbueringer]

Changes look good

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 7380b093faf44d246e1b58a8f4c7e9dab2843969

[sbueringer]

/hold cancel