Bump spring.boot.version from 4.0.2 to 4.0.3

Bumps `spring.boot.version` from 4.0.2 to 4.0.3.

Updates `org.springframework.boot:spring-boot-dependencies` 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)

Updates `org.springframework.boot:spring-boot-maven-plugin` 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:spring-boot-dependencies
  dependency-version: 4.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  dependency-version: 4.0.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -21,7 +21,7 @@
     <maven.compiler.source>21</maven.compiler.source>
     <maven.compiler.target>21</maven.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <spring.boot.version>4.0.2</spring.boot.version>
+    <spring.boot.version>4.0.3</spring.boot.version>
   </properties>
 
   <repositories>