upgrade kotlin version

Author: mythz

src/AndroidClient/build.gradle

@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.10'
+    ext.kotlin_version = '1.3.61'
     repositories {
         jcenter()
         maven {

src/AndroidClient/kotlin/build.gradle

@@ -31,7 +31,7 @@ dependencies {
     androidTestImplementation 'com.google.code.gson:gson:2.8.2'
 }
 buildscript {
-    ext.kotlin_version = '1.3.10'
+    ext.kotlin_version = '1.3.61'
     repositories {
         mavenCentral()
     }