dependabot: Block cert-manager

[Jakob-Naucke]

With our goal to stay on k8s 1.35 for easier downstreaming, cert-manager must also be blocked or 1.36 will be pulled as transitive dependency.

Summary by Sourcery

Build:

• Update Dependabot configuration to restrict cert-manager version upgrades to 1.21 or higher without advancing Kubernetes beyond 1.35.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Jakob-Naucke

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates Dependabot configuration to block cert-manager upgrades beyond version 1.21 in order to prevent pulling Kubernetes 1.36 as a transitive dependency and keep the stack aligned with Kubernetes 1.35.

Flow diagram for Dependabot blocking cert-manager upgrades

flowchart LR
  Dependabot[Dependabot Go module updates]
  Config[dependabot.yml ignore rule]
  CertManager[Dependency github.com/cert-manager/cert-manager]
  K8s135[Kubernetes 1.35 compatible]
  K8s136[Kubernetes 1.36 transitive dependency]

  Dependabot --> CertManager
  CertManager --> Config
  Config -->|ignore versions >= 1.21| Dependabot
  CertManager -->|kept <= 1.21| K8s135
  CertManager -.-|blocked >= 1.21| K8s136

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File-Level Changes

Change	Details	Files
Configure Dependabot to ignore cert-manager versions >= 1.21 for Go module updates to avoid pulling Kubernetes 1.36 transitively.	Add a new ignore rule for the cert-manager Go module dependency. Specify a version constraint (>=1.21) under the existing Go module updates configuration so Dependabot will not propose PRs for newer cert-manager versions.	.github/dependabot.yml

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