upgraded kotlin, gradle, added drift

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -1,12 +0,0 @@
-//
-//  Generated file. Do not edit.
-//
-
-import FlutterMacOS
-import Foundation
-
-import flutter_inappwebview_macos
-
-func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
-  InAppWebViewFlutterPlugin.register(with: registry.registrar(forPlugin: "InAppWebViewFlutterPlugin"))
-}

macos/RunnerTests/RunnerTests.swift

@@ -0,0 +1,12 @@
+import Cocoa
+import FlutterMacOS
+import XCTest
+
+class RunnerTests: XCTestCase {
+
+  func testExample() {
+    // If you add code to the Runner application, consider adding tests here.
+    // See https://developer.apple.com/documentation/xctest for more information about using XCTest.
+  }
+
+}