Allow trailing comma (microsoft/vscode-remote-release#2231)

extensions/configuration-editing/schemas/attachContainer.schema.json

@@ -2,6 +2,7 @@
 	"$schema": "http://json-schema.org/draft-07/schema#",
 	"description": "Configures an attached to container",
 	"allowComments": true,
+	"allowTrailingCommas": true,
 	"type": "object",
 	"definitions": {
 		"attachContainer": {

extensions/configuration-editing/schemas/devContainer.schema.json

@@ -2,6 +2,7 @@
 	"$schema": "http://json-schema.org/draft-07/schema#",
 	"description": "Defines a dev container",
 	"allowComments": true,
+	"allowTrailingCommas": true,
 	"type": "object",
 	"definitions": {
 		"devContainerCommon": {