Update vendor containers/(common,image)

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/opencontainers/image-spec/specs-go/v1/manifest.go

@@ -1,4 +1,4 @@
-// Copyright 2016 The Linux Foundation
+// Copyright 2016-2022 The Linux Foundation
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -30,6 +30,9 @@ type Manifest struct {
 	// Layers is an indexed list of layers referenced by the manifest.
 	Layers []Descriptor `json:"layers"`
 
+	// Refers is an optional link to any existing manifest within the repository.
+	Refers *Descriptor `json:"refers,omitempty"`
+
 	// Annotations contains arbitrary metadata for the image manifest.
 	Annotations map[string]string `json:"annotations,omitempty"`
 }