Fix dependency management.

build.gradle.kts

@@ -1,7 +1,13 @@
+object Versions {
+	const val springBoot = "3.4.3"
+	const val springDependencyManagement = "1.1.7"
+	const val kotlinJvm = "1.9.25"
+	const val kotlinPluginSpring = "1.9.25"
+}
+
 plugins {
 	kotlin("jvm") version "1.9.25"
 	kotlin("plugin.spring") version "1.9.25"
-	id("org.springframework.boot") version "3.4.4"
 	id("io.spring.dependency-management") version "1.1.7"
 }
 
@@ -19,18 +25,23 @@ repositories {
 }
 
 subprojects {
+	apply(plugin = "java")
+	apply(plugin = "org.jetbrains.kotlin.jvm")
+
 	repositories {
 		mavenCentral()
 	}
+
+	dependencies {
+		implementation(platform("org.springframework.boot:spring-boot-dependencies:${Versions.springBoot}"))
+	}
+
 }
 
-dependencies {
-	implementation("org.springframework.boot:spring-boot-starter-web")
-	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
-	implementation("org.jetbrains.kotlin:kotlin-reflect")
-	testImplementation("org.springframework.boot:spring-boot-starter-test")
-	testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
-	testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+dependencyManagement {
+	imports {
+		mavenBom("org.springframework.boot:spring-boot-dependencies:${Versions.springBoot}")
+	}
 }
 
 kotlin {