chore: remove 1.13

[ThatsMrTalbot]

Signed-off-by: Adam Talbot adam.talbot@venafi.com

[cert-manager-prow[bot]]

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[cert-manager-prow[bot]]

@ThatsMrTalbot: Updated the following 3 configmaps:

• job-config configmap in namespace default at cluster default using the following files:
  • key cert-manager-release-1.13.yaml using file ``
  • key cert-manager-release-1.14.yaml using file config/jobs/cert-manager/cert-manager/release-1.14/cert-manager-release-1.14.yaml
  • key cert-manager-release-1.15.yaml using file config/jobs/cert-manager/cert-manager/release-1.15/cert-manager-release-1.15.yaml
• plugins configmap in namespace default at cluster default using the following files:
  • key plugins.yaml using file config/plugins.yaml
• config configmap in namespace default at cluster default using the following files:
  • key config.yaml using file config/config.yaml

In response to [this](https://github.com/cert-manager/testing/pull/1031): >Signed-off-by: Adam Talbot Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.