Bump org.springframework.boot from 4.0.2 to 4.0.3

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 4.0.2 to 4.0.3.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v4.0.2...v4.0.3)

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

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -18,7 +18,7 @@ assertk = "0.28.1"
 # https://github.com/google/ksp/releases
 ksp = "2.3.5"
 # https://plugins.gradle.org/plugin/org.springframework.boot
-spring-boot = "4.0.2"
+spring-boot = "4.0.3"
 # https://plugins.gradle.org/plugin/io.spring.dependency-management
 spring-depedency-management = "1.1.7"
 # https://github.com/r2dbc/r2dbc-pool