Bump org.springframework.boot in /other-examples/java

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.3.4 to 4.0.2.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.3.4...v4.0.2)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  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]

other-examples/java/settings.gradle

@@ -1,7 +1,7 @@
 pluginManagement {
   plugins {
     id 'com.diffplug.spotless' version '8.1.0'
-    id 'org.springframework.boot' version '3.3.4'
+    id 'org.springframework.boot' version '4.0.2'
     id 'com.github.johnrengelman.shadow' version '8.1.1'
   }
 }