Fix deploy action on node 6

Downgrade @types/node to version 6 as we support node6

Change-type: patch

lib/utils/patterns.ts

@@ -283,5 +283,7 @@ export function exitWithExpectedError(message: string | Error): never {
 	}
 
 	printErrorMessage(message);
-	return process.exit(1);
+	process.exit(1);
+	// The following throw is to make tsc happy about the `never` return type.
+	throw new Error('exit');
 }