Update plugin org.springframework.boot to v3.4.3

Author: renovate[bot]

build.gradle

@@ -10,7 +10,7 @@ plugins {
     id "info.solidsoft.pitest" version '1.15.0'
     id 'io.spring.dependency-management' version '1.1.7'
     id 'org.sonarqube' version '6.0.1.5171'
-    id 'org.springframework.boot' version '3.3.7'
+    id 'org.springframework.boot' version '3.4.3'
     id "org.flywaydb.flyway" version '9.22.3'
     id 'au.com.dius.pact' version '4.6.16'
     id 'org.owasp.dependencycheck' version '11.1.1'