[CI] use golang v1.16 (#339)
Reviewed-on: https://gitea.com/gitea/tea/pulls/339
Reviewed-by: Andrew Thornton
Reviewed-by: Lunny Xiao
Co-authored-by: 6543 <6543@obermui.de>
Co-committed-by: 6543 <6543@obermui.de>
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