Use reply.elapsedTime to log response time

src/routes/autohooks.js

@@ -42,7 +42,7 @@ export default async function (app, opts) {
 
   // Logs the request with the 'debug' level and also logs headers with the 'trace' level
   app.addHook('onResponse', (req, reply, done) => {
-    const responseTime = reply.getResponseTime()
+    const responseTime = reply.elapsedTime
     const loggingOptions = { url: req.raw.url, res: reply, method: req.method, responseTime }
     /* c8 ignore next */
     if (process.env.LOG_LEVEL === 'trace') loggingOptions.headers = req.headers