Update recaptcha to v3
Google recaptcha v3 has now been officially released: https://webmasters.googleblog.com/2018/10/introducing-recaptcha-v3-new-way-to.html
Obviously v2 is still working for the time being but it would be beneficial to update core to use v3. For example one of our clients is currently seeing this issue (significant usability bug in iOS): https://github.com/google/recaptcha/issues/130
Thanks!