Merge pull request #2094 from Netflix/feature/downgrade-kotlin

Downgrading Kotlin back to 1.9 because that's what Spring Boot aligns on

Author: paulbakker

buildSrc/src/main/kotlin/Versions.kt

@@ -15,5 +15,5 @@
  */
 
 object Versions {
-    const val KOTLIN_VERSION = "2.1.0"
+    const val KOTLIN_VERSION = "1.9.20"
 }