Bump FlipperKit version on iOS to be compatible with react-native-fli… (#28225)

Summary:
This diff updated FlipperKit to be compatible with the latest react-native-flipper version.

## Changelog

(nothing changes compared to what is already in the changelog for RN 0.62.0)

[iOS][Fixed] - Upgraded FlipperKit to 0.32.2 to ensure compatibility with latest `react-native-flipper`
Pull Request resolved: https://github.com/facebook/react-native/pull/28225

Test Plan:
Tested by upgrading the ReactNativeFlipperExample (https://github.com/facebook/flipper/tree/master/react-native/ReactNativeFlipperExample) to RN 0.62.0-rc.3 and verified the example plugin works. (In D20221558)

![Screen Shot 2020-03-04 at 11 26 52](https://user-images.githubusercontent.com/1820292/75875163-18167e80-5e0b-11ea-8a7d-504bb27757db.png)

Reviewed By: priteshrnandgaonkar

Differential Revision: D20249666

Pulled By: mweststrate

fbshipit-source-id: 71a61c4249f8b767c7767d5c6133436c9bc9cf26

scripts/react_native_pods.rb

@@ -57,7 +57,7 @@ def use_react_native! (options={})
   end
 end
 
-def use_flipper!(version = '~> 0.30.2')
+def use_flipper!(version = '~> 0.32.2')
   pod 'FlipperKit', version, :configuration => 'Debug'
   pod 'FlipperKit/FlipperKitLayoutPlugin', version, :configuration => 'Debug'
   pod 'FlipperKit/SKIOSNetworkPlugin', version, :configuration => 'Debug'