Spring Security Update Documentation about CAS Authentication

Describe the bug The class org.springframework.security.cas.authentication.EhCacheBasedTicketCache has been removed in spring-security 6.x but is still referenced in the documentation.

To Reproduce Go to https://docs.spring.io/spring-security/reference/servlet/authentication/cas.html#cas-pt and look for EhCacheBasedTicketCache. EhCacheBasedTicketCache was deprecated in spring-security 5.6, then removed in spring-security 6.x.

This is the link for the github doccumentation: https://github.com/spring-projects/spring-security/blob/2455feb37947dab10b79b1905be40046257370bb/docs/modules/ROOT/pages/servlet/authentication/cas.adoc?plain=1#L451-L463

Expected behavior I believe the documentation can be updated to use SpringCacheBasedTicketCache instead.