Update cert-manager module and documentation
Summary
The Operator is build with the cert-manager 1.6.1 module which is also referenced in our documentation: https://gitlab.com/gitlab-org/cloud-native/gitlab-operator/-/blob/9aea1fda3bcd6c067040e43b6e852e5eda1483df/doc/installation.md#L124.
Cert-manager 1.6 is EOL since 2022-04-04. The GitLab Operator should update to a maintained version.
Acceptance criteria
-
Update cert-manager to a maintained version: https://cert-manager.io/docs/releases/#currently-supported-releases -
Update docs to recommend a cert-manager version matching the clusters K8s/OCP version