schema: updates for legacy-oscontainer entry

These changes come from calling:
`make schema && cd mantle && go vendor`

Author: jmarrero

mantle/vendor/github.com/coreos/coreos-assembler/pkg/builds/cosa_v1.go

@@ -1,7 +1,7 @@
 package builds
 
 // generated by 'make schema'
-// source hash: 144450d458f89f637ca487d353af3dfd60096ddbf3179da8e2b42b2bd2d0a6eb
+// source hash: 3508b2f150e72b8e24151d870789809cf4070cec6b4716966a4e8bc585e0c5f1
 
 type AdvisoryDiff []AdvisoryDiffItems
 
@@ -101,6 +101,7 @@ type BuildArtifacts struct {
 	Iso                 *Artifact `json:"iso,omitempty"`
 	Kernel              *Artifact `json:"kernel,omitempty"`
 	KubeVirt            *Artifact `json:"kubevirt,omitempty"`
+	LegacyOscontainer   *Artifact `json:"legacy-oscontainer,omitempty"`
 	LiveInitramfs       *Artifact `json:"live-initramfs,omitempty"`
 	LiveIso             *Artifact `json:"live-iso,omitempty"`
 	LiveKernel          *Artifact `json:"live-kernel,omitempty"`

mantle/vendor/github.com/coreos/coreos-assembler/pkg/builds/schema_doc.go

@@ -1,5 +1,5 @@
 // Generated by ./generate-schema.sh
-// Source hash: 144450d458f89f637ca487d353af3dfd60096ddbf3179da8e2b42b2bd2d0a6eb
+// Source hash: 3508b2f150e72b8e24151d870789809cf4070cec6b4716966a4e8bc585e0c5f1
 // DO NOT EDIT
 
 package builds
@@ -446,6 +446,7 @@ var generatedSchemaJSON = `{
         "digitalocean",
         "exoscale",
         "extensions-container",
+        "legacy-oscontainer",
         "gcp",
         "kubevirt",
         "ibmcloud",
@@ -492,6 +493,12 @@ var generatedSchemaJSON = `{
           "title": "extensions-container",
           "$ref": "#/definitions/artifact"
         },
+        "legacy-oscontainer": {
+          "$id": "#/properties/images/properties/legacy-oscontainer",
+          "type": "object",
+          "title": "legacy-oscontainer",
+          "$ref": "#/definitions/artifact"
+        },
         "qemu": {
           "$id": "#/properties/images/properties/qemu",
           "type": "object",