Update module github.com/cert-manager/cert-manager to v1.21.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/cert-manager/cert-manager	v1.21.0 → v1.21.1

---

Release Notes

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

v1.21.1

Compare Source

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[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):

• 10 additional dependencies were updated

Details:

Package	Change
github.com/google/cel-go	v0.26.0 -> v0.29.0
go.opentelemetry.io/otel	v1.43.0 -> v1.44.0
go.opentelemetry.io/otel/metric	v1.43.0 -> v1.44.0
go.opentelemetry.io/otel/trace	v1.43.0 -> v1.44.0
golang.org/x/mod	v0.36.0 -> v0.37.0
golang.org/x/sync	v0.21.0 -> v0.22.0
golang.org/x/text	v0.38.0 -> v0.40.0
golang.org/x/tools	v0.45.0 -> v0.47.0
google.golang.org/genproto/googleapis/api	v0.0.0-20260319201613-d00831a3d3e7 -> v0.0.0-20260414002931-afd174a4e478
google.golang.org/grpc	v1.81.1 -> v1.82.1