Upgrade notice says patch instead of minor

[rvennam]

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[istio-testing]

In response to a cherrypick label: new pull request created: #11195

[istio-testing]

In response to a cherrypick label: new pull request could not be created: failed to create pull request against istio/istio.io#release-1.13 from head istio-testing:cherry-pick-11194-to-release-1.13: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"A pull request already exists for istio-testing:cherry-pick-11194-to-release-1.13."}],"documentation_url":"https://docs.github.com/rest/reference/pulls#create-a-pull-request"}