specify iOS version 9 so that we can use Xcode 13 tools to publish

Author: emawby

OneSignal.podspec

@@ -8,7 +8,7 @@ Pod::Spec.new do |s|
 
   s.source           = { :git => "https://github.com/OneSignal/OneSignal-iOS-SDK.git", :tag => s.version.to_s }
 
-  s.platform         = :ios
+  s.platform         = :ios, "9.0"
   s.requires_arc     = true
 
   s.ios.vendored_frameworks = 'iOS_SDK/OneSignalSDK/Framework/OneSignal.framework'

OneSignalDynamic.podspec

@@ -8,7 +8,7 @@ Pod::Spec.new do |s|
 
    s.source           = { :git => "https://github.com/OneSignal/OneSignal-iOS-SDK.git", :tag => s.version.to_s }
 
-   s.platform         = :ios, "8.0"
+   s.platform         = :ios, "9.0"
    s.requires_arc     = true
 
    s.ios.vendored_frameworks = 'iOS_SDK/OneSignalSDK/Framework/Dynamic/OneSignal.framework'