Move lazy var access to the MainActor (#3333)

Task/Issue URL: https://app.asana.com/0/1193060753475688/1208204608199357/f
Tech Design URL:
CC:

Description:

This PR makes a speculative fix for an lazy var access issue

DuckDuckGo/AppDelegate.swift

@@ -59,6 +59,7 @@ import os.log
     private let widgetRefreshModel = NetworkProtectionWidgetRefreshModel()
     private let tunnelDefaults = UserDefaults.networkProtectionGroupDefaults
 
+    @MainActor
     private lazy var vpnWorkaround: VPNRedditSessionWorkaround = {
         return VPNRedditSessionWorkaround(
             accountManager: AppDependencyProvider.shared.accountManager,
@@ -576,7 +577,7 @@ import os.log
     }
 
     func applicationWillResignActive(_ application: UIApplication) {
-        Task {
+        Task { @MainActor in
             await refreshShortcuts()
             await vpnWorkaround.removeRedditSessionWorkaround()
         }