Bump org.springframework.boot in /getting-started-guides/java (#499)

Bumps [org.springframework.boot](https://github.com/spring-projects/spring-boot) from 3.2.0 to 3.2.1.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.2.0...v3.2.1)

---
updated-dependencies:
- dependency-name: org.springframework.boot
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

getting-started-guides/java/settings.gradle

@@ -1,7 +1,7 @@
 pluginManagement {
   plugins {
     id 'com.diffplug.spotless' version '6.23.0'
-    id 'org.springframework.boot' version '3.2.0'
+    id 'org.springframework.boot' version '3.2.1'
     id 'de.undercouch.download' version '5.5.0'
   }
 }