android: Update Kotlin version to 1.9.20

src/android/app/build.gradle.kts

@@ -10,7 +10,7 @@ plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
     id("kotlin-parcelize")
-    kotlin("plugin.serialization") version "1.8.21"
+    kotlin("plugin.serialization") version "1.9.20"
     id("androidx.navigation.safeargs.kotlin")
     id("org.jlleitschuh.gradle.ktlint") version "11.4.0"
 }

src/android/build.gradle.kts

@@ -5,7 +5,7 @@
 plugins {
     id("com.android.application") version "8.1.2" apply false
     id("com.android.library") version "8.1.2" apply false
-    id("org.jetbrains.kotlin.android") version "1.8.21" apply false
+    id("org.jetbrains.kotlin.android") version "1.9.20" apply false
 }
 
 tasks.register("clean").configure {