chore(deps): bump k8s.io/api from 0.20.5 to 0.21.0

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

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

go.mod

@@ -69,7 +69,7 @@ require (
 	google.golang.org/appengine v1.6.7 // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
-	k8s.io/api v0.20.5
+	k8s.io/api v0.21.0
 	k8s.io/apiextensions-apiserver v0.20.2 // indirect
 	k8s.io/apimachinery v0.20.5
 	k8s.io/client-go v0.20.5