chore(deps): bump org.springframework.boot from 3.5.7 to 4.0.0

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.5.7 to 4.0.0.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.7...v4.0.0)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 kotlin = "2.3.20-dev-2461"
-spring-boot = "3.5.7"
+spring-boot = "4.0.0"
 spring-dependency-managment = "1.1.7"
 springdoc = "2.8.14"
 aws-serverless-java-container-springboot3 = "2.1.5"