title: Error: multiple dependencies with different sources for `React` in `Podfile` after podfile update
body: <p>I am upgrading react-native from 0.59.10 to 0.66.2 version. After editing the files like suggested in <a href="https://github.com/react-native-community/upgrade-helper" rel="nofollow noreferrer">rn-upgrade helper</a>
  Im facing an error when running <em>pod install</em>:</p>
  <p><a href="https://i.stack.imgur.com/tAAey.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tAAey.png" alt="enter image description here" /></a></p>
  <p>Also whats strange I dont have this dependencies in the Podfile :</p>
  <p>(I tried already running pod clean cache deintegrate etc..)</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>require_relative '../node_modules/react-native/scripts/react_native_pods'
  require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'
  
  platform :ios, '11.0'
  
  target 'RnDiffApp' do
    config = use_native_modules!
  
    use_react_native!(
      :path =&gt; config[:reactNativePath],
      # to enable hermes on iOS, change `false` to `true` and then install pods
      :hermes_enabled =&gt; false
    )
  
    target 'RnDiffAppTests' do
      inherit! :complete
      # Pods for testing
    end
  
    # Enables Flipper.
    #
    # Note that if you have use_frameworks! enabled, Flipper will not work and
    # you should disable the next line.
    use_flipper!()
  
    post_install do |installer|
      react_native_post_install(installer)
      __apply_Xcode_12_5_M1_post_install_workaround(installer)
    end
  end</code></pre>
  </div>
  </div>
  </p>