Bump sigs.k8s.io/controller-runtime from 0.6.4 to 0.8.3

Bumps [sigs.k8s.io/controller-runtime](https://github.com/kubernetes-sigs/controller-runtime) from 0.6.4 to 0.8.3.
- [Release notes](https://github.com/kubernetes-sigs/controller-runtime/releases)
- [Commits](kubernetes-sigs/controller-runtime@v0.6.4...v0.8.3)

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

go.mod

@@ -24,10 +24,10 @@ require (
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/viper v1.7.1
 	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
-	k8s.io/api v0.18.9
-	k8s.io/apimachinery v0.18.9
-	k8s.io/client-go v0.18.9
-	sigs.k8s.io/controller-runtime v0.6.4
+	k8s.io/api v0.20.2
+	k8s.io/apimachinery v0.20.2
+	k8s.io/client-go v0.20.2
+	sigs.k8s.io/controller-runtime v0.8.3
 )
 
 // v3.3.10 is required by spf13/viper. Can remove this replace when updated.