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

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

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

go.mod

@@ -71,7 +71,7 @@ require (
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 	k8s.io/api v0.20.5
 	k8s.io/apiextensions-apiserver v0.20.2 // indirect
-	k8s.io/apimachinery v0.20.5
+	k8s.io/apimachinery v0.21.0
 	k8s.io/client-go v0.20.5
 	k8s.io/klog/v2 v2.5.0 // indirect
 	k8s.io/kube-openapi v0.0.0-20210113233702-8566a335510f // indirect