Add correct deserialization class to listInAppPurchasesV2PricePoints

[srowan]

Small bug fix. This was using the wrong class (csv?)

[srowan]

Sorry, not sure what's going on with the whitespace differences 😓

[cantie]

I've look at this issue, since Resource classes are generated from here:
https://developer.apple.com/sample-code/app-store-connect/app-store-connect-openapi-specification.zip so in this case I believe it was unproperly handle.
In some API if response with 200 HTTP status code, the content object is can be csv or another resource object.

I've planned to open the parse openapi.json project also, so maybe you can help me check this out?
For now I need time to review other APIs with the same situation to make sure we can use Resource object instead of csv.

Best Regards,