build(deps): bump gopkg.in/yaml.v2 from 2.3.0 to 2.4.0 (#1528)

Bumps [gopkg.in/yaml.v2](https://github.com/go-yaml/yaml) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/go-yaml/yaml/releases)
- [Commits](go-yaml/yaml@v2.3.0...v2.4.0)

Signed-off-by: dependabot[bot] <[email protected]>
Signed-off-by: Xiang Dai <[email protected]>
Co-authored-by: Xiang Dai <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -67,7 +67,7 @@ require (
 	golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634 // indirect
 	golang.org/x/text v0.3.4 // indirect
 	golang.org/x/tools v0.0.0-20201013201025-64a9e34f3752
-	gopkg.in/yaml.v2 v2.3.0
+	gopkg.in/yaml.v2 v2.4.0
 	honnef.co/go/tools v0.0.1-2020.1.6
 	mvdan.cc/gofumpt v0.0.0-20200802201014-ab5a8192947d
 	mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed