updated library-service to Kotlin 1.2.21
updated library-service to Kotlin 1.2.21

Spring Data included in Spring Boot M7 has a known bug with Kotlin 1.2 and was temporarily manually upgraded to 2.0.4.RELEASE in order to fix that incompatibility.
nt-ca-aqe/library-app,nt-ca-aqe/library-app,nt-ca-aqe/library-app,nt-ca-aqe/library-app,nt-ca-aqe/library-app