Use kotlin version 1.3.72

Change-Id: Ib06238a5685f36905e0bcdcdcb30ffcfcb6766ef
diff --git a/buildSrc/src/main/java/kotlin/Kotlinc.java b/buildSrc/src/main/java/kotlin/Kotlinc.java
index 9c29870..efb39aa 100644
--- a/buildSrc/src/main/java/kotlin/Kotlinc.java
+++ b/buildSrc/src/main/java/kotlin/Kotlinc.java
@@ -30,7 +30,7 @@
 
   private static final Path kotlincExecPath =
       Paths.get(
-          "third_party", "kotlin", "kotlin-compiler-1.3.11", "kotlinc", "bin", kotlincExecName);
+          "third_party", "kotlin", "kotlin-compiler-1.3.72", "kotlinc", "bin", kotlincExecName);
 
   enum KotlinTargetVersion {
     JAVA_6("1.6"),