update go version in devcontainer to 1.20 to match version in go.mod (#…

…402)

.devcontainer/devcontainer.json

@@ -35,6 +35,6 @@
 	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
 	"remoteUser": "node",
 	"features": {
-		"golang": "1.19"
+		"golang": "1.20"
 	}
 }