chore: Upgrade SpringBoot v3.0.6

build.gradle

 plugins {
     id 'java'
     // https://start.spring.io
-    id 'org.springframework.boot' version '3.0.5'
+    id 'org.springframework.boot' version '3.0.6'
     id 'org.graalvm.buildtools.native' version '0.9.20'
     // https://plugins.gradle.org/plugin/io.spring.dependency-management
     id 'io.spring.dependency-management' version '1.1.0'