build: bump spring-boot.version from 4.0.2 to 4.0.3 in /example

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:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

example/pom.xml

@@ -13,7 +13,7 @@
     <maven.compiler.source>${java.version}</maven.compiler.source>
     <maven.compiler.target>${java.version}</maven.compiler.target>
     <junit-jupiter.version>6.0.3</junit-jupiter.version>
-    <spring-boot.version>4.0.2</spring-boot.version>
+    <spring-boot.version>4.0.3</spring-boot.version>
     <cucumber.version>7.34.2</cucumber.version>
     <springdoc-openapi-starter.version>3.0.1</springdoc-openapi-starter.version>
     <pre-liquibase.version>2.0.0</pre-liquibase.version>