Bump springboot.version from 4.0.0 to 4.0.3

Bumps `springboot.version` from 4.0.0 to 4.0.3.

Updates `org.springframework.boot:spring-boot-dependencies` from 4.0.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v4.0.0...v4.0.3)

Updates `org.springframework.boot:spring-boot-maven-plugin` from 4.0.0 to 4.0.3
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v4.0.0...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]

examples/spring-web/pom.xml

@@ -16,7 +16,7 @@
   </description>
 
   <properties>
-    <springboot.version>4.0.0</springboot.version>
+    <springboot.version>4.0.3</springboot.version>
   </properties>
 
   <dependencyManagement>

examples/springboot/pom.xml

@@ -16,7 +16,7 @@
   </description>
 
   <properties>
-    <springboot.version>4.0.0</springboot.version>
+    <springboot.version>4.0.3</springboot.version>
   </properties>
 
   <dependencyManagement>