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
• https://spring.io/blog/2025/11/20/spring-boot-4-0-0-available-now
• https://habr.com/ru/companies/spring_aio/articles/968898/ Spring Boot 4. Новые модули. Зачем? (short)
• https://spring.io/blog/2025/09/30/the-state-of-http-clients-in-spring
• https://spring.io/blog/2025/10/07/introducing-jackson-3-support-in-spring
  • https://habr.com/ru/companies/spring_aio/articles/956366/ (Russian translation)
• https://spring.io/blog/2025/10/28/modularizing-spring-boot
• https://spring.io/blog/2025/11/12/null-safe-applications-with-spring-boot-4
• https://spring.io/blog/2025/11/18/opentelemetry-with-spring-boot
• https://dev.to/eddybenchek/spring-boot-3x-40-migration-what-actually-broke-and-how-we-fixed-it-36ap
  • https://habr.com/ru/articles/991790/ (Russian translation)

Spring Framework 7.0.x:

• https://spring.io/blog/2025/09/09/core-spring-resilience-features
• https://spring.io/blog/2025/09/16/api-versioning-in-spring
  • https://habr.com/ru/companies/spring_aio/articles/967454/ (Russian translation)

Spring Security 7.0.x:

• https://spring.io/blog/2025/10/21/multi-factor-authentication-in-spring-security-7

Should be done after #1740