Bump spring-boot.version from 3.5.7 to 4.0.0

Bumps `spring-boot.version` from 3.5.7 to 4.0.0.

Updates `org.springframework.boot:spring-boot-dependencies` from 3.5.7 to 4.0.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.7...v4.0.0)

Updates `org.springframework.boot:spring-boot-maven-plugin` from 3.5.7 to 4.0.0
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.5.7...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]

exec/pom.xml

@@ -29,7 +29,7 @@
 
   <properties>
     <root.basedir>${project.parent.basedir}</root.basedir>
-    <spring-boot.version>3.5.7</spring-boot.version>
+    <spring-boot.version>4.0.0</spring-boot.version>
     <!-- We do not want to deploy the `exec` uber jar. -->
     <maven.deploy.skip>true</maven.deploy.skip>
   </properties>