Update builder to go 1.16 and remove godep

[adammw]

The built-in builder dockerfile is out of date, and does not successfully build a working Node Problem Detector binary.

This PR updates it to go 1.16 (the version currently used in Travis) and removes godep, which was removed back in #287.

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Hi @adammw. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: adammw
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[Random-Liu]

/ok-to-test

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/lifecycle stale

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/lifecycle rotten

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

In response to this:

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This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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