bump ggcr in gccr/k8schain _what_! (google#1030)

Author: dprotaso

pkg/authn/k8schain/go.mod

@@ -3,7 +3,7 @@ module github.com/google/go-containerregistry/pkg/authn/k8schain
 go 1.14
 
 require (
-	github.com/google/go-containerregistry v0.4.1-0.20210128200529-19c2b639fab1
+	github.com/google/go-containerregistry v0.5.2-0.20210601193515-0ffa4a5c8691
 	github.com/vdemeester/k8s-pkg-credentialprovider v1.21.0-1
 	k8s.io/api v0.21.1
 	k8s.io/apimachinery v0.21.1