Update golang version to 1.16

[Syulin7]

No description provided.

[cr-gpt]

Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information

[Syulin7]

/lgtm
/approve

[google-oss-prow]

@Syulin7: you cannot LGTM your own PR.

In response to this:

/lgtm
/approve

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Syulin7
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