Update to Kotlin 1.3.72

Closes gh-8786

gradle.properties

@@ -2,7 +2,7 @@ aspectjVersion=1.9.3
 gaeVersion=1.9.80
 springBootVersion=2.3.0.RELEASE
 version=5.4.0-SNAPSHOT
-kotlinVersion=1.3.70
+kotlinVersion=1.3.72
 org.gradle.jvmargs=-Xmx3g -XX:MaxPermSize=2048m -XX:+HeapDumpOnOutOfMemoryError
 org.gradle.parallel=true
 org.gradle.caching=true