chore(deps): update helm release cert-manager to v1.8.1

This MR contains the following updates:

Package	Update	Change
cert-manager	patch	v1.8.0 -> v1.8.1

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Release Notes

cert-manager/cert-manager

v1.8.1

Compare Source

cert-manager is the easiest way to automatically manage certificates in Kubernetes and OpenShift clusters.

1.8.1 is a patch release rebuilding cert-manager 1.8 using the latest version of Go.

Changelog since cert-manager 1.7.1

• Reverts a check for Prometheus APIs before creating cert-manager ServiceMonitors which broke users' GitOps flows (cert-manager#​5204)

• Bumps the version of Go used to build the cert-manager binaries to 1.17.11 which fixes a few CVEs (we don't think that those were likely to be exploited in cert-manager) (cert-manager#​5203, @​irbekrm )

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