Update example app to use the latest AppAuth-iOS version

Example/ios/Podfile.lock

@@ -1,9 +1,9 @@
 PODS:
-  - AppAuth (1.2.0):
-    - AppAuth/Core (= 1.2.0)
-    - AppAuth/ExternalUserAgent (= 1.2.0)
-  - AppAuth/Core (1.2.0)
-  - AppAuth/ExternalUserAgent (1.2.0)
+  - AppAuth (1.4.0):
+    - AppAuth/Core (= 1.4.0)
+    - AppAuth/ExternalUserAgent (= 1.4.0)
+  - AppAuth/Core (1.4.0)
+  - AppAuth/ExternalUserAgent (1.4.0)
   - boost-for-react-native (1.63.0)
   - CocoaAsyncSocket (7.6.4)
   - CocoaLibEvent (1.0.0)
@@ -241,8 +241,8 @@ PODS:
     - React-cxxreact (= 0.63.2)
     - React-jsi (= 0.63.2)
   - React-jsinspector (0.63.2)
-  - react-native-app-auth (5.1.2):
-    - AppAuth (= 1.2.0)
+  - react-native-app-auth (6.0.0-rc1):
+    - AppAuth (= 1.4.0)
     - React
   - React-RCTActionSheet (0.63.2):
     - React-Core/RCTActionSheetHeaders (= 0.63.2)
@@ -431,7 +431,7 @@ EXTERNAL SOURCES:
     :path: "../node_modules/react-native/ReactCommon/yoga"
 
 SPEC CHECKSUMS:
-  AppAuth: bce82c76043657c99d91e7882e8a9e1a93650cd4
+  AppAuth: 31bcec809a638d7bd2f86ea8a52bd45f6e81e7c7
   boost-for-react-native: 39c7adb57c4e60d6c5479dd8623128eb5b3f0f2c
   CocoaAsyncSocket: 694058e7c0ed05a9e217d1b3c7ded962f4180845
   CocoaLibEvent: 2fab71b8bd46dd33ddb959f7928ec5909f838e3f
@@ -458,7 +458,7 @@ SPEC CHECKSUMS:
   React-jsi: 54245e1d5f4b690dec614a73a3795964eeef13a8
   React-jsiexecutor: 8ca588cc921e70590820ce72b8789b02c67cce38
   React-jsinspector: b14e62ebe7a66e9231e9581279909f2fc3db6606
-  react-native-app-auth: 8e7e938c218cdad10abe284083a3351036150b3a
+  react-native-app-auth: 4d01428fd6e411cf47ae172286d9f6572520721a
   React-RCTActionSheet: 910163b6b09685a35c4ebbc52b66d1bfbbe39fc5
   React-RCTAnimation: 9a883bbe1e9d2e158d4fb53765ed64c8dc2200c6
   React-RCTBlob: 39cf0ece1927996c4466510e25d2105f67010e13