Upgrade to Kotlin 1.5.30
Upgrade to Kotlin 1.5.30

Also upgrades related libraries:
- Coroutines upgraded to 1.5.2
- Serialization upgraded to 1.2.2

Closes gh-27371

spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework,spring-projects/spring-framework