fix(deps): update module github.com/cert-manager/cert-manager to v1.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/cert-manager/cert-manager	v1.20.3 → v1.21.0

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Release Notes

cert-manager/cert-manager (github.com/cert-manager/cert-manager)

v1.21.0

Compare Source

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[renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 5 additional dependencies were updated

Details:

Package	Change
k8s.io/utils	v0.0.0-20260507154919-ff6756f316d2 -> v0.0.0-20260626114624-be93311217bd
github.com/go-ldap/ldap/v3	v3.4.12 -> v3.4.13
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc	v0.65.0 -> v0.67.0
google.golang.org/genproto/googleapis/rpc	v0.0.0-20260401024825-9d38bb4040a9 -> v0.0.0-20260610212136-7ab31c22f7ad
google.golang.org/grpc	v1.80.0 -> v1.81.1

[cert-manager-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[cert-manager-prow]

Hi @renovate[bot]. Thanks for your PR.

I'm waiting for a cert-manager 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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[cert-manager-prow]

@renovate[bot]: The following tests 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-cert-manager-cmctl-test	8f8cc28	link	true	/test pull-cert-manager-cmctl-test
pull-cert-manager-cmctl-verify	8f8cc28	link	true	/test pull-cert-manager-cmctl-verify
pull-cert-manager-cmctl-integration	8f8cc28	link	true	/test pull-cert-manager-cmctl-integration

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.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.