Merge pull request #257 from kit-data-manager/renovate/org.springframework.boot-3.x

Update plugin org.springframework.boot to v3.5.6

Author: ThomasJejkal

build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'org.springframework.boot' version '3.5.5'
+    id 'org.springframework.boot' version '3.5.6'
     id 'io.spring.dependency-management' version '1.1.7'
     id 'org.asciidoctor.jvm.convert' version '4.0.5'
     id 'io.freefair.maven-publish-java' version '8.14.2'