Update golang to 1.13 version

[thinkerou]

Changes

Update golang to 1.13 version

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[tekton-robot]

Hi @thinkerou. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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@thinkerou: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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[imjasonh]

/ok-to-test

Thanks!

[ghost]

/lgtm

[afrittoli]

Thank you for your contribution!

Could you give some more context for this change?
This changes the version of go in the ko docker image that is used to build pipeline nightly and full releases, so it may be worth mentioning that in the commit message.

It's probably ok, but I'd like to understand if there is any specific feature in 1.13 that we're looking for.

[vdemeester]

So, the prow jobs are now running with go 1.13, so this should be able to get in 👼
/approve
/lgtm

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