Update errcheck

[leventov]

Note that I removed checker.UpdateNonVendoredIgnore() call.

Test fail in test/testdata/errcheck.go, IgnoreStdxWrite() function:

func IgnoreStdxWrite() {
	os.Stdout.Write([]byte{})
	os.Stderr.Write([]byte{})
}

Not sure how to fix this (and how did it work before the change).

Related to kisielk/errcheck#185

Depend on #1319

@SVilgelm @sayboras could you please review?

[boring-cyborg]

Hey, thank you for opening your first Pull Request !

[CLAassistant]

All committers have signed the CLA.

[ldez]

Hello @leventov,

As your PR point to an old branch, I'm not sure that we will be able to merge without bypassing the CI.

So I cherry-picked your commit and rebase the branch of #1319.

Thank you very much 👍