Update Spring Boot to 4.0.x

[php-coder]

Changelogs:

• https://spring.io/blog/2025/07/24/spring-boot-4-0-0-M1-available-now
• https://spring.io/blog/2025/08/21/spring-boot-4-0-0-M2-available-now
• https://spring.io/blog/2025/09/18/spring-boot-4-0-0-M3-available-now
• https://spring.io/blog/2025/10/23/spring-boot-4-0-0-RC1-available-now
• https://spring.io/blog/2025/11/06/spring-boot-4-0-0-RC2-available-now

Should be done after #1740