Update plugin org.springframework.boot to v3.4.3

Author: renovate[bot]

build.gradle

@@ -4,7 +4,7 @@ import java.io.File
 plugins {
     id 'checkstyle'
     id 'io.spring.dependency-management' version '1.1.7'
-    id 'org.springframework.boot' version '3.2.4'
+    id 'org.springframework.boot' version '3.4.3'
     id 'com.github.ben-manes.versions' version '0.52.0'
     id 'java-library'
     id 'maven-publish'