Creating a Spring Boot 4.x Kotlin project with JSON support still uses Jackson 2's Kotlin module

[hantsy]

When creating a Spring Boot 4/Kotlin project, it will include the legacy com.fastxml.com Kotlin module, which is not comparable with Spring Boot 4/Jackson 3.

Use tools.jackson.module:jackson-module-kotlin instead to align with SB 4.

[mhalbritter]

Superseded by #1733.