Update to Kotlin 1.3.72

Closes gh-8645

gradle.properties

@@ -3,4 +3,4 @@ gaeVersion=1.9.80
 springBootVersion=2.2.7.RELEASE
 version=5.3.3.BUILD-SNAPSHOT
 org.gradle.jvmargs=-Xmx3g -XX:MaxPermSize=2048m -XX:+HeapDumpOnOutOfMemoryError
-kotlinVersion=1.3.70
+kotlinVersion=1.3.72