Update kotlin_version to v1.5.31 (#14)

renovate[bot] · renovate-bot · web-flow · commit 0e4a1773d76f · 2021-10-06T20:06:22.000+07:00
Co-authored-by: Renovate Bot &lt;bot@renovateapp.com&gt;
diff --git a/android/build.gradle b/android/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.3.72'
+    ext.kotlin_version = '1.5.31'
     repositories {
         google()
         jcenter()
