Update plugin org.springframework.boot to v3.4.3

Author: renovate[bot]

build.gradle.kts

@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    id("org.springframework.boot") version "3.3.2"
+    id("org.springframework.boot") version "3.4.3"
     id("io.spring.dependency-management") version "1.1.6"
     kotlin("jvm") version "2.0.10"
     kotlin("plugin.spring") version "2.0.10"