Fix old integration_test links (#94020)

packages/integration_test/integration_test_macos/ios/integration_test_macos.podspec

@@ -9,7 +9,7 @@ Pod::Spec.new do |s|
   No-op implementation of integration to avoid build issues on iOS.
   See https://github.com/flutter/flutter/issues/39659
                        DESC
-  s.homepage         = 'https://github.com/flutter/plugins/tree/master/packages/integration_test/integration_test_macos'
+  s.homepage         = 'https://github.com/flutter/flutter/tree/master/packages/integration_test/integration_test_macos'
   s.license          = { :file => '../LICENSE' }
   s.author           = { 'Flutter Team' => 'flutter-dev@googlegroups.com' }
   s.source           = { :path => '.' }

packages/integration_test/integration_test_macos/pubspec.yaml

 name: integration_test_macos
 description: Desktop implementation of integration_test plugin
 version: 0.0.1+1
-homepage: https://github.com/flutter/plugins/tree/master/packages/integration_test/integration_test_macos
+homepage: https://github.com/flutter/flutter/tree/master/packages/integration_test/integration_test_macos
 
 flutter:
   plugin: