Update plugin org.springframework.boot to v3.3.4

Author: renovate[bot]

build.gradle.kts

@@ -1,7 +1,7 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    id("org.springframework.boot") version "3.1.1" apply false
+    id("org.springframework.boot") version "3.3.4" apply false
     id("io.spring.dependency-management") version "1.1.0" apply false
     kotlin("jvm") version "1.8.21" apply false
     kotlin("plugin.spring") version "1.8.21" apply false