Bump k8s.io/apimachinery from 0.20.6 to 0.21.3 (ko-build#391)

Bumps [k8s.io/apimachinery](https://github.com/kubernetes/apimachinery) from 0.20.6 to 0.21.3.
- [Release notes](https://github.com/kubernetes/apimachinery/releases)
- [Commits](kubernetes/apimachinery@v0.20.6...v0.21.3)

---
updated-dependencies:
- dependency-name: k8s.io/apimachinery
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

go.mod

@@ -12,7 +12,6 @@ require (
 	github.com/google/go-containerregistry v0.5.2-0.20210622202051-acad0ede73ff
 	github.com/gregjones/httpcache v0.0.0-20190212212710-3befbb6ad0cc // indirect
 	github.com/mattmoor/dep-notify v0.0.0-20190205035814-a45dec370a17
-	github.com/onsi/gomega v1.10.3 // indirect
 	github.com/spf13/cobra v1.1.3
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5
@@ -21,9 +20,7 @@ require (
 	golang.org/x/tools v0.1.2
 	gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
-	k8s.io/apimachinery v0.20.6
+	k8s.io/apimachinery v0.21.3
 	k8s.io/cli-runtime v0.20.6
-	k8s.io/klog/v2 v2.5.0 // indirect
-	k8s.io/kube-openapi v0.0.0-20201113171705-d219536bb9fd // indirect
 	sigs.k8s.io/kind v0.8.1
 )