Golang 1.20.6 for test runner

[strongjz]

start golang 1.20.6 upgrade

[k8s-ci-robot]

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✅ Deploy Preview for kubernetes-ingress-nginx canceled.

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[rikatz]

/lgtm
/approve
tks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rikatz, strongjz

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[strongjz]

/cherry-pick release-1.8

[k8s-infra-cherrypick-robot]

@strongjz: new pull request created: #10231

In response to this:

/cherry-pick release-1.8

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.