Update the pod tests to match the new min iOS version.

objectivec/Tests/CocoaPods/iOSCocoaPodsTester/Podfile-framework

@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false
 

objectivec/Tests/CocoaPods/iOSCocoaPodsTester/Podfile-static

@@ -1,5 +1,5 @@
 source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
+platform :ios, '9.0'
 
 install! 'cocoapods', :deterministic_uuids => false