Update Kubernetes v1.18.3 dependencies (#1197)

Signed-off-by: 1gtm <1gtm@appscode.com>

Author: 1gtm

go.mod

@@ -34,7 +34,7 @@ require (
 	gopkg.in/ini.v1 v1.51.0
 	k8s.io/api v0.18.3
 	k8s.io/apiextensions-apiserver v0.18.3
-	k8s.io/apimachinery v0.18.8
+	k8s.io/apimachinery v0.18.3
 	k8s.io/apiserver v0.18.3
 	k8s.io/client-go v12.0.0+incompatible
 	k8s.io/kube-aggregator v0.18.3

vendor/modules.txt

@@ -627,7 +627,7 @@ k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset
 k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/scheme
 k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/typed/apiextensions/v1
 k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset/typed/apiextensions/v1beta1
-# k8s.io/apimachinery v0.18.8 => github.com/kmodules/apimachinery v0.19.0-alpha.0.0.20200520235721-10b58e57a423
+# k8s.io/apimachinery v0.18.3 => github.com/kmodules/apimachinery v0.19.0-alpha.0.0.20200520235721-10b58e57a423
 k8s.io/apimachinery/pkg/api/equality
 k8s.io/apimachinery/pkg/api/errors
 k8s.io/apimachinery/pkg/api/meta