chore(deps): bump spring-boot.version from 3.2.5 to 4.0.2

Bumps `spring-boot.version` from 3.2.5 to 4.0.2.

Updates `org.springframework.boot:spring-boot-starter` from 3.2.5 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.2.5...v4.0.2)

Updates `org.springframework.boot:spring-boot-autoconfigure` from 3.2.5 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.2.5...v4.0.2)

Updates `org.springframework.boot:spring-boot-configuration-processor` from 3.2.5 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.2.5...v4.0.2)

Updates `org.springframework.boot:spring-boot-starter-test` from 3.2.5 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.2.5...v4.0.2)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-starter
  dependency-version: 4.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-autoconfigure
  dependency-version: 4.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-configuration-processor
  dependency-version: 4.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-starter-test
  dependency-version: 4.0.2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

mjml-java-spring/pom.xml

@@ -17,7 +17,7 @@
     <description>Spring Boot auto-configuration for mjml-java MJML-to-HTML renderer</description>
 
     <properties>
-        <spring-boot.version>3.2.5</spring-boot.version>
+        <spring-boot.version>4.0.2</spring-boot.version>
         <thymeleaf.version>3.1.2.RELEASE</thymeleaf.version>
     </properties>