title: after flutter upgrade to 3.0, manifest.lock is deleted after "flutter pub get"
body: <p>I am super newbie on flutter and programming also on this side stack overflow too.</p>
  <p>Few days ago, Like everybody know, Flutter had a big update.</p>
  <p>After That, after Flutter Clean -&gt; Flutter pub get,</p>
  <p>Then, my 'manifest.lock' is auto deleted (&quot;flutter project/ios/pods/manifest.lock&quot;)</p>
  <p>So i have to remake that file every time I want to build on Xcode.
  ㄴ&gt; I'm using the method from this article. (thank you always)
  <a href="https://stackoverflow.com/questions/64263716/could-not-build-application-for-the-simulator-for-flutter">Could not build application for the simulator for flutter</a></p>
  <p>Anyway, I wan't to fix the origin of this problem.
  Is there anyone who can help me out from this?!</p>