feat: update mock endpoint spec

Author: christyjacob4

templates/android/library/src/main/java/io/appwrite/Client.kt.twig

@@ -40,7 +40,7 @@ import kotlin.coroutines.resume
 
 class Client @JvmOverloads constructor(
     context: Context,
-    var endPoint: String = "https://appwrite.io/v1",
+    var endPoint: String = "{{spec.endpoint}}",
     var endPointRealtime: String? = null,
     private var selfSigned: Boolean = false
 ) : CoroutineScope {

templates/kotlin/src/main/kotlin/io/appwrite/Client.kt.twig

@@ -34,7 +34,7 @@ import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.resume
 
 class Client @JvmOverloads constructor(
-    var endPoint: String = "https://appwrite.io/v1",
+    var endPoint: String = "{{spec.endpoint}}",
     private var selfSigned: Boolean = false
 ) : CoroutineScope {