fix timeout of golangci-lint #2946
Merged
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golangci-lint often exit with code 4, which represents timeout, after PR merge into master.

This is due to the default settings of golangci-lint, which is 1m, and timeout option can be set.
In most cases, they're over the time limit slightly, which were just a few seconds, so that I think it's good to pass timeout option and set as 5m as lots of OSS do.