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They recently updated all the examples in the javadocs if you wanna bump your Spring Security version to 5.7.3 (see here). Otherwise the reference docs all reflect the non-deprecated approach that uses SecurityFilterChain and supporting beans.
Your example is pretty unconventional though — it seems like you're sort of rolling your own authorization server which will make things difficult. The project has been diligent about removing support for "issuing" JWTs and things like that. If you asked a maintainer about your current approach they'd probably point you to https://spring.io/projects/spring-authorization-server.