Update docker-in-docker to major version 2 (#470)

Author: joshspicer

.devcontainer/devcontainer.json

@@ -20,7 +20,7 @@
 	"remoteUser": "node",
 
 	"features": {
-		"ghcr.io/devcontainers/features/docker-in-docker:1": {}
+		"ghcr.io/devcontainers/features/docker-in-docker:2": {}
 	},
 
 	"customizations": {