Bump spring-boot-version from 3.5.0 to 4.0.3

Bumps `spring-boot-version` from 3.5.0 to 4.0.3.

Updates `org.springframework.boot:spring-boot-starter` from 3.5.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.0...v4.0.3)

Updates `org.springframework.boot:spring-boot-starter-test` from 3.5.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.0...v4.0.3)

Updates `org.springframework.boot:spring-boot-starter-webflux` from 3.5.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.0...v4.0.3)

Updates `org.springframework.boot:spring-boot-starter-websocket` from 3.5.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.0...v4.0.3)

Updates `org.springframework.boot:spring-boot-starter-security` from 3.5.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.0...v4.0.3)

Updates `org.springframework.boot:spring-boot-autoconfigure` from 3.5.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.0...v4.0.3)

Updates `org.springframework.boot:spring-boot-configuration-processor` from 3.5.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.0...v4.0.3)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-starter-test
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-starter-webflux
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-starter-websocket
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-starter-security
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-autoconfigure
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-configuration-processor
  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]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ kotlin-version = "2.2.21"
 kotlin-x-version = "1.10.2"
 kotlinx-serialization-version = "1.9.0"
 slf4j-version = "2.0.17"
-spring-boot-version = "3.5.0"
+spring-boot-version = "4.0.3"
 ktor-version = "3.4.0"
 ktor-server-version = "3.4.0"
 lettuce-version = "6.7.1.RELEASE"