Update veggieseasons Runners (#2411)

This PR updates `veggieseasons` to use current Runners for iOS and macOS

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-devrel
channel on [Discord].

<!-- Links -->
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md
[CLA]: https://cla.developers.google.com/
[Discord]:
https://github.com/flutter/flutter/blob/master/docs/contributing/Chat.md
[Contributors Guide]:
https://github.com/flutter/samples/blob/main/CONTRIBUTING.md

veggieseasons/macos/Runner/MainFlutterWindow.swift

@@ -3,7 +3,7 @@ import FlutterMacOS
 
 class MainFlutterWindow: NSWindow {
   override func awakeFromNib() {
-    let flutterViewController = FlutterViewController.init()
+    let flutterViewController = FlutterViewController()
     let windowFrame = self.frame
     self.contentViewController = flutterViewController
     self.setFrame(windowFrame, display: true)