deps: Update Flutter version in pubspec.lock too

Oops, left this out in the previous commit.  This edit gets
made automatically when running `flutter pub get` or other
commands like `flutter run`.

Author: gnprice

pubspec.lock

@@ -1369,4 +1369,4 @@ packages:
     version: "0.0.1"
 sdks:
   dart: ">=3.7.0-224.0.dev <4.0.0"
-  flutter: ">=3.27.0-1.0.pre.744"
+  flutter: ">=3.28.0-1.0.pre.35"