APM-6214 disable version exposure as per sonarcloud

Author: sophieclayton12-nhs

docker/hello-world-sandbox/src/app.js

@@ -1,6 +1,7 @@
 const express = require('express');
 
 const app = express();
+app.disable("x-powered-by");
 const PORT = process.env.PORT || 9000;