build(deps): bump spring-boot.version from 3.4.4 to 4.0.2

Bumps `spring-boot.version` from 3.4.4 to 4.0.2.

Updates `org.springframework.boot:spring-boot-starter` from 3.4.4 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.4.4...v4.0.2)

Updates `org.springframework.boot:spring-boot-starter-web` from 3.4.4 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.4.4...v4.0.2)

Updates `org.springframework.boot:spring-boot-starter-actuator` from 3.4.4 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.4.4...v4.0.2)

Updates `org.springframework.boot:spring-boot-starter-data-jpa` from 3.4.4 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.4.4...v4.0.2)

Updates `org.springframework.boot:spring-boot-starter-test` from 3.4.4 to 4.0.2
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.4.4...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-starter-web
  dependency-version: 4.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-starter-actuator
  dependency-version: 4.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-starter-data-jpa
  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:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pom.xml

@@ -39,7 +39,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
     <!-- Spring Boot related dependencies. Keep these in sync! -->
-    <spring-boot.version>3.4.4</spring-boot.version>
+    <spring-boot.version>4.0.2</spring-boot.version>
     <junit.version>5.11.4</junit.version>
     <mockito.version>5.14.2</mockito.version>
     <logback.version>1.5.18</logback.version>