Set MaxResponseTime to 495ms

Finishing the response takes about 1ms, so
we can still easily meet the 500ms timeout.

src/numbers/numbers.go

@@ -19,7 +19,7 @@ type Numbers struct {
 }
 
 // The maximum response time of the handlers.
-var MaxResponseTime time.Duration = 450 * time.Millisecond
+var MaxResponseTime time.Duration = 495 * time.Millisecond
 
 // The main entry point of the backend.
 func main() {