Upgrade to Spring Framework 6.1

[arey]

Plan upgrade from the Spring Framework 6.0.x version to the Spring Framework 6.1 :

• Spring Framework 6.1 RC1 released: https://spring.io/blog/2023/10/12/spring-framework-6-1-rc1-released
• Spring Framework 6.1 goes GA: https://spring.io/blog/2023/11/16/spring-framework-6-1-goes-ga
• Spring Framework 6.0.15 and 6.1.2 available now: https://spring.io/blog/2023/12/14/spring-framework-6-0-15-and-6-1-2-available-now