Sentry: Fix staging URL in allowUrls (#8779)

Author: Turbo87

app/sentry.js

@@ -20,7 +20,7 @@ export function init() {
     ...config.sentry,
     integrations,
 
-    allowUrls: ['crates.io', 'crates-io.herokuapp.com', 'staging.crates-io', 'staging-crates-io.herokuapp.com'],
+    allowUrls: ['crates.io', 'crates-io.herokuapp.com', 'staging.crates.io', 'staging-crates-io.herokuapp.com'],
 
     beforeSend(event, hint) {
       let error = hint?.originalException;