Bump org.springframework.boot:spring-boot-maven-plugin (#3461)

Bumps [org.springframework.boot:spring-boot-maven-plugin](https://github.com/spring-projects/spring-boot) from 3.1.1 to 3.2.0.
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.1.1...v3.2.0)

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

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

apm-agent-plugins/apm-spring-webflux/apm-spring-webflux-testapp/pom.xml

@@ -96,7 +96,7 @@
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
                 <!-- explicit version required as bom will not cover plugins, only dependencies -->
-                <version>3.1.1</version>
+                <version>3.2.0</version>
                 <configuration>
                     <mainClass>co.elastic.apm.agent.springwebflux.testapp.WebFluxApplication</mainClass>
                     <!-- by default original jar is replaced, which makes impossible to reuse as dependency -->