Fix plugin.serialization version

Author: shepeliev

README.md

@@ -63,7 +63,7 @@ The Firebase Kotlin SDK uses Kotlin serialization to read and write custom class
 ```groovy
 plugins {
     kotlin("multiplatform") // or kotlin("jvm") or any other kotlin plugin
-    kotlin("plugin.serialization") version "1.4.10"
+    kotlin("plugin.serialization") version "1.5.10"
 }
 ```
 

firebase-common/build.gradle.kts

@@ -9,7 +9,7 @@ version = project.property("firebase-common.version") as String
 plugins {
     id("com.android.library")
     kotlin("multiplatform")
-    kotlin("plugin.serialization") version "1.5.0"
+    kotlin("plugin.serialization") version "1.5.10"
 }
 
 android {

firebase-firestore/build.gradle.kts

@@ -9,7 +9,7 @@ version = project.property("firebase-firestore.version") as String
 plugins {
     id("com.android.library")
     kotlin("multiplatform")
-    kotlin("plugin.serialization") version "1.5.0"
+    kotlin("plugin.serialization") version "1.5.10"
 }
 
 android {