Update plugin org.springframework.boot to v3.5.6

Author: renovate[bot]

build.gradle

@@ -5,7 +5,7 @@ plugins {
   id 'jacoco'
   id 'io.spring.dependency-management' version '1.1.7'
   id 'org.owasp.dependencycheck' version '10.0.4'
-  id 'org.springframework.boot' version '3.4.1'
+  id 'org.springframework.boot' version '3.5.6'
   id 'com.github.ben-manes.versions' version '0.52.0'
   id 'org.sonarqube' version '6.3.1.5724'
   id "org.flywaydb.flyway" version '9.22.3'