[v11] Update minimum platform versions for 11.0.0 (#13066)

FirebaseCoreExtension.podspec

@@ -20,12 +20,12 @@ Pod::Spec.new do |s|
     }
     s.social_media_url = 'https://twitter.com/Firebase'
 
-    s.swift_version = '5.3'
+    s.swift_version = '5.9'
 
-    s.ios.deployment_target = '10.0'
-    s.osx.deployment_target = '10.13'
-    s.tvos.deployment_target = '12.0'
-    s.watchos.deployment_target = '6.0'
+    s.ios.deployment_target = '12.0'
+    s.osx.deployment_target = '10.15'
+    s.tvos.deployment_target = '13.0'
+    s.watchos.deployment_target = '7.0'
 
     s.source_files = 'FirebaseCore/Extension/*.[hm]'
     s.public_header_files = 'FirebaseCore/Extension/*.h'