feat: use laminas-recaptcha 3.8.0's RecaptchaServiceInterface

[earthiverse]

Q	A
Documentation	no
Bugfix	no
BC Break	maybe?
New Feature	no
RFC	yes
QA	no

Description

This package uses a final class for the service provider on Recaptcha, which prevents users from actually providing their own service provider. This uses a proposed Interface instead to fix that. See the related merge request on laminas-recaptcha

I'm not sure about laminas's best practices, let me know if there are things that need fixing.