chore(deps): update plugin org.springframework.boot to v3.5.6

Author: renovate[bot]

service/build.gradle

@@ -17,7 +17,7 @@ plugins {
   id 'checkstyle'
   id 'jacoco'
   id 'io.spring.dependency-management' version '1.1.6'
-  id 'org.springframework.boot' version '3.3.5'
+  id 'org.springframework.boot' version '3.5.6'
   id 'com.github.ben-manes.versions' version '0.51.0'
   id 'org.sonarqube' version '6.2.0.5505'
   id 'project-report'