fix(deps): update dependency org.jetbrains.kotlin:kotlin-gradle-plugin to v1.9.21

Author: renovate[bot]

android/build.gradle

@@ -7,7 +7,7 @@ buildscript {
         compileSdkVersion = 30
         targetSdkVersion = 30
         ndkVersion = "21.4.7075529"
-        kotlinVersion = '1.5.31'
+        kotlinVersion = '1.9.21'
         supportLibVersion = "28.0.0"
     }
     repositories {