fix: move swift-tools-version to first line of Package.swift

Remove commented swift-tools-version line.

Author: SalihCanBinboga

ios/facebook_app_events/Package.swift

@@ -1,9 +1,9 @@
+// swift-tools-version: 5.9
 // Copyright (c) Oddbit (https://oddbit.id)
 //
 // This source file is part of facebook_app_events.
 // Licensed under the Apache License, Version 2.0. See LICENSE and NOTICE.
 
-// swift-tools-version: 5.9
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription