chore(deps): bump k8s.io/code-generator from 0.20.5 to 0.21.0 (#319)

Bumps [k8s.io/code-generator](https://github.com/kubernetes/code-generator) from 0.20.5 to 0.21.0.
- [Release notes](https://github.com/kubernetes/code-generator/releases)
- [Commits](kubernetes/code-generator@v0.20.5...v0.21.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -15,8 +15,6 @@ require (
 	github.com/kong/go-kong v0.17.0
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/mitchellh/mapstructure v1.2.2 // indirect
-	github.com/onsi/ginkgo v1.7.0 // indirect
-	github.com/onsi/gomega v1.4.3 // indirect
 	github.com/pelletier/go-toml v1.7.0 // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/sergi/go-diff v1.1.0 // indirect
@@ -31,7 +29,7 @@ require (
 	github.com/yudai/gojsondiff v1.0.0
 	github.com/yudai/golcs v0.0.0-20170316035057-ecda9a501e82 // indirect
 	github.com/yudai/pp v2.0.1+incompatible // indirect
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
 	gopkg.in/ini.v1 v1.55.0 // indirect
-	k8s.io/code-generator v0.20.5
+	k8s.io/code-generator v0.21.0
 )