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

@@ -4,20 +4,23 @@ go 1.14
 
 require (
 	github.com/Masterminds/semver/v3 v3.1.1
+	github.com/asaskevich/govalidator v0.0.0-20200428143746-21a406dcc535 // indirect
 	github.com/giantswarm/apiextensions/v2 v2.6.2
 	github.com/giantswarm/backoff v0.2.0
 	github.com/giantswarm/errors v0.3.0
 	github.com/giantswarm/k8sclient/v4 v4.1.0
 	github.com/giantswarm/microerror v0.3.0
 	github.com/giantswarm/micrologger v0.5.0
-	github.com/go-openapi/runtime v0.19.20 // indirect
+	github.com/go-openapi/errors v0.19.6 // indirect
+	github.com/go-openapi/swag v0.19.9 // indirect
 	github.com/google/go-cmp v0.5.5
+	github.com/mailru/easyjson v0.7.1 // indirect
+	github.com/mitchellh/mapstructure v1.3.2 // indirect
 	github.com/spf13/cobra v1.1.3
-	k8s.io/api v0.18.9
-	k8s.io/apimachinery v0.18.9
-	k8s.io/client-go v0.18.9
-	k8s.io/utils v0.0.0-20200731180307-f00132d28269 // indirect
-	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
 	sigs.k8s.io/yaml v1.2.0
 )