Update test exclusion for new name

Author: stuartmorgan-g

script/configs/exclude_integration_ios.yaml

@@ -1,5 +1,5 @@
 # Currently missing: https://github.com/flutter/flutter/issues/81695
-- in_app_purchase_ios
+- in_app_purchase_storekit
 # Currently missing: https://github.com/flutter/flutter/issues/82208
 - ios_platform_images
 # Hangs on CI. Deprecated, so there is no plan to fix it.