v9 release plan.

[mshima]

Overview of the feature request

• Spring Boot v3.5.0 due by May 22 https://github.com/spring-projects/spring-boot/milestone/371.
• drop node 18 support.
• change default cache provider Security concerns of having Ehcache as the default #28546.
• change gradle groovy dsl to kotlin dsl Migrate gradle build files to kotlin dsl #28653

Motivation for or Use Case

Related issues or PR

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[atomfrede]

I would like to have the gradle kotlin dsl used instead of the groovy one. It won't go away I suppose but the default is now the kotlin variant for a few years or so.