Update spring boot to v3.5.6 (#1392)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'application'
     id 'java'
     id 'io.spring.dependency-management' version '1.1.7'
-    id 'org.springframework.boot' version '3.5.5'
+    id 'org.springframework.boot' version '3.5.6'
     id 'com.github.ben-manes.versions' version '0.52.0'
     id 'com.gorylenko.gradle-git-properties' version '2.5.3'
     id 'info.solidsoft.pitest' version '1.15.0'
@@ -178,7 +178,7 @@ def versions = [
         serenity                        : '4.2.34',
         serviceAuthProviderClient       : '5.3.3',
         serviceTokenGenerator           : '0.6.0',
-        springBootVersion               : '3.5.5',
+        springBootVersion               : '3.5.6',
         springCloudWiremock             : '4.3.0',
         springDocOpenUi                 : '2.8.13',
         swaggerAnnotations              : '2.2.37',