Spring Security Upgrade Unboundid to 6.0.6

Expected Behavior

Support latest improvements and better defaults for security protocols such as removing SHA1 prefering TLS1.3. Also for embedded you no longer need to enable the operational attriubutes.

https://nawilson.com/2021/05/28/unboundid-ldap-sdk-for-java-6-0-0/

Current Behavior

Works but falling a number of major versions behind which can be an audit concern.

Context

The initial request was related to bug (not unboundid but in the autoconfig) in embedded ldap springboot https://github.com/spring-projects/spring-boot/issues/23030

Comment From: jzheaux

Before marking this at 6.x, let's see there is a way to have 5.6.x support both UnboundId 4 and the latest, similar to what was done with #9095. This way, 5.6.x can have the latest UnboundId support while allowing folks to stay on UnboundId 4.x if needed.

Comment From: rwinch

For this issue we should also ensure old unboundid support is removed in 6.0.x

Comment From: marcusdacoregio

Unboundid 6.x already works with Spring Security 5.x, users can opt into it if they want. Spring Boot also uses Unboundid 6.x in 2.7.