Update to Kotlin 1.4.10

Closes gh-9111

gradle.properties

@@ -3,7 +3,7 @@ gaeVersion=1.9.82
 springJavaformatVersion=0.0.25
 springBootVersion=2.4.0-M3
 version=5.4.1-SNAPSHOT
-kotlinVersion=1.3.72
+kotlinVersion=1.4.10
 org.gradle.jvmargs=-Xmx3g -XX:MaxPermSize=2048m -XX:+HeapDumpOnOutOfMemoryError
 org.gradle.parallel=true
 org.gradle.caching=true