Update kotlin monorepo to v1.9.0 (#1023)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

samples/sample-spring-boot-echo-kotlin/build.gradle.kts

@@ -17,8 +17,8 @@
 plugins {
     id("sdk.java-library")
     id("sdk.spring-boot")
-    kotlin("jvm") version "1.8.22"
-    kotlin("plugin.spring") version "1.8.22"
+    kotlin("jvm") version "1.9.0"
+    kotlin("plugin.spring") version "1.9.0"
 }
 
 dependencies {