default JWT should be 3.0.0-beta.12 not 3.0.0-beta.7 when we upgrade react-native 0.61.2 or above (#1710)

Author: pengcao1

CodePush.podspec

@@ -22,6 +22,6 @@ Pod::Spec.new do |s|
   # linked properly at a parent workspace level.
   s.dependency 'React'
   s.dependency 'SSZipArchive', '~> 2.1'
-  s.dependency 'JWT', '~> 3.0.0-beta.7'
+  s.dependency 'JWT', '~> 3.0.0-beta.12'
   s.dependency 'Base64', '~> 1.1'
 end