Spring Security released 5.8 and 6.0 on the same day. In Spring Security 5.8 there are various deprecations (mainly from the configuration) that have been removed in 6.0. However, this is not that clear in the Spring Boot migration guide. Since there is no Spring Boot version that is using Spring Security 5.8 it means that users that are only using Spring Boot dependency management are never going to get warnings for the deprecations.
I suggest that you update the https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.0-Release-Notes and either link to https://docs.spring.io/spring-security/reference/5.8/migration/index.html or write what is written in https://docs.spring.io/spring-security/reference/5.8/migration/index.html#_update_to_spring_security_5_8.
I believe that this would make the upgrade to Spring Boot 3.0 easier for users that are using Spring Security
Comment From: wilkinsona
Thanks for the suggestion. I've added something to Spring Boot's migration guide.
Comment From: filiphr
Thanks a lot @wilkinsona. This is really appreciated.