Bump org.springframework.boot from 3.5.5 to 4.0.3

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.5.5 to 4.0.3.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.5...v4.0.3)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

settings.gradle.kts

@@ -22,7 +22,7 @@ pluginManagement {
         mavenLocal()
     }
     plugins {
-        id("org.springframework.boot") version "3.5.5"
+        id("org.springframework.boot") version "4.0.3"
         id("org.jlleitschuh.gradle.ktlint") version "14.0.1"
         id("io.spring.dependency-management") version "1.1.7"
         id("dev.yumi.gradle.licenser") version "2.2.2"