Bump spring.boot.version from 3.5.6 to 4.0.0

Bumps `spring.boot.version` from 3.5.6 to 4.0.0.

Updates `org.springframework.boot:spring-boot-dependencies` from 3.5.6 to 4.0.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.6...v4.0.0)

Updates `org.springframework.boot:spring-boot-maven-plugin` from 3.5.6 to 4.0.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.6...v4.0.0)

---
updated-dependencies:
- dependency-name: org.springframework.boot:spring-boot-dependencies
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.springframework.boot:spring-boot-maven-plugin
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pom.xml

@@ -128,7 +128,7 @@
         <maven-license-plugin.version>5.0.0</maven-license-plugin.version>
 
         <!-- Spring -->
-        <spring.boot.version>3.5.6</spring.boot.version>
+        <spring.boot.version>4.0.0</spring.boot.version>
         <spring.admin.version>3.5.6</spring.admin.version>
         <springdoc.version>2.8.13</springdoc.version>