warning in gtmetrix

hi, i used for a time your plugin and i deleted it for some reasons….now if i detect my site https://gtmetrix.com/reports/musicaperiltuomatrimonio.it/kuGgLBR3 i see a warning Leverage browser caching for the following cacheable resources:

https://www.google.com/recaptcha/api.js?onload=qodeRecaptchaCallback (5 minutes)

but i deleted it lot of time ago, so what can you tell me about? i deleted all cache and so on…please thanks

The page I need help with: [log in to see the link]