Remove upgrade alert (#1320)

Update AppDelegate.swift

Author: austincondiff

CodeEdit/AppDelegate.swift

@@ -18,20 +18,6 @@ final class AppDelegate: NSObject, NSApplicationDelegate, ObservableObject {
 
         NSApp.closeWindow(.welcome, .about)
 
-        let upgradeAlert = NSAlert()
-        upgradeAlert.messageText = "Upgrade Available"
-        upgradeAlert.informativeText = """
-A new CodeEdit update is available, but can't be auto-updated.\
- Please download the latest version to keep receiving the latest updates.
-"""
-        upgradeAlert.addButton(withTitle: "Download New Version")
-        switch upgradeAlert.runModal() {
-        case .alertFirstButtonReturn:
-            NSWorkspace.shared.open(URL(string: "https://github.com/CodeEditApp/CodeEdit/releases/latest")!)
-        default:
-            break
-        }
-
         DispatchQueue.main.async {
             var needToHandleOpen = true