[WIP][DO NOT MERGE] bump go 1.13

[aojea]

No description provided.

[aojea]

/assign @bowei
can you please take a look at the job error?
/hold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

@aojea: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-service-apis-build	e79fd6a	link	/test pull-service-apis-build

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[aojea]

Fixed by #7