Redis reads session once not twice during cleanup

[kinsersh]

I noticed that the session gets read twice at https://github.com/spring-projects/spring-session/blob/4dc81ec10d0e2870bb6f208df924b2ab933a835e/spring-session-data-redis/src/main/java/org/springframework/session/data/redis/ReactiveRedisIndexedSessionRepository.java#L441-L442

This alters the code to only read it once.