Bump springboot.version in /hello-websocket-java/springboot/client

Bumps `springboot.version` from 3.2.3 to 3.2.4.

Updates `org.springframework.boot:spring-boot-starter-websocket` from 3.2.3 to 3.2.4
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.2.3...v3.2.4)

Updates `org.springframework.boot:spring-boot-maven-plugin` from 3.2.3 to 3.2.4
- [Release notes](https://github.com/spring-projects/spring-boot/releases)
- [Commits](spring-projects/spring-boot@v3.2.3...v3.2.4)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

hello-websocket-java/springboot/client/pom.xml

@@ -14,7 +14,7 @@
         <java.version>21</java.version>
         <maven.compiler.source>21</maven.compiler.source>
         <maven.compiler.target>21</maven.compiler.target>
-        <springboot.version>3.2.3</springboot.version>
+        <springboot.version>3.2.4</springboot.version>
         <!-- https://mvnrepository.com/artifact/com.coveo/fmt-maven-plugin -->
         <fmt-maven-plugin.version>2.23</fmt-maven-plugin.version>
     </properties>