Use Gradle 9.2.0 for generated Spring Boot 4 projects

[albihasani94]

https://docs.gradle.org/9.2.0/release-notes.html

---

Gradle 9.2.0 has been released

[mhalbritter]

Blocked on spring-projects/spring-boot#47867.

[wilkinsona]

spring-projects/spring-boot#47875 will result in Spring Boot 4.0.x being tested against Gradle 9.2.

[mhalbritter]

The Boot issue is merged, we'll now wait for RC2, which is released on Nov 6th.

[mhalbritter]

Superseded by #1716.