Bump k8s.io/cli-runtime from 0.19.4 to 0.21.1

Bumps [k8s.io/cli-runtime](https://github.com/kubernetes/cli-runtime) from 0.19.4 to 0.21.1.
- [Release notes](https://github.com/kubernetes/cli-runtime/releases)
- [Commits](kubernetes/cli-runtime@v0.19.4...v0.21.1)

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

Author: dependabot[bot]

go.mod

@@ -16,9 +16,9 @@ require (
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.7.0
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c
-	k8s.io/api v0.19.4
-	k8s.io/apimachinery v0.19.4
-	k8s.io/cli-runtime v0.19.4
-	k8s.io/client-go v0.19.4
+	k8s.io/api v0.21.1
+	k8s.io/apimachinery v0.21.1
+	k8s.io/cli-runtime v0.21.1
+	k8s.io/client-go v0.21.1
 	sigs.k8s.io/yaml v1.2.0
 )