build(deps): bump k8s.io/apimachinery from 0.18.0 to 0.18.1 (#3826)

Bumps [k8s.io/apimachinery](https://github.com/kubernetes/apimachinery) from 0.18.0 to 0.18.1.
- [Release notes](https://github.com/kubernetes/apimachinery/releases)
- [Commits](https://github.com/kubernetes/apimachinery/compare/v0.18.0...v0.18.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

go.mod

@@ -44,7 +44,7 @@ require (
 	google.golang.org/grpc v1.28.0
 	gopkg.in/DataDog/dd-trace-go.v1 v1.23.1
 	k8s.io/api v0.18.0
-	k8s.io/apimachinery v0.18.0
+	k8s.io/apimachinery v0.18.1
 	k8s.io/client-go v0.18.0
 	k8s.io/klog v1.0.0
 )