config: update custom-metrics-apiserver to go 1.18

[dgrisonnet]

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[dashpole]

/lgtm

[k8s-ci-robot]

@dgrisonnet: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key custom-metrics-apiserver-presubmits.yaml using file config/jobs/kubernetes-sigs/custom-metrics-apiserver/custom-metrics-apiserver-presubmits.yaml

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