Fix type for Shop#google_apps_login_enabled

[kirillplatonov]

Description

Fixes #1334

Fixes incorrect type of Shop#google_apps_login_enabled attribute in REST API.

How has this been tested?

This code can be used to reproduce the issue and test the fix:

shop = Shop.last
shopify_shop = shop.with_shopify_session do
  ShopifyAPI::Shop.all.first
end
shop_data = shopify_shop.to_hash
shop_data["google_apps_login_enabled"] = true
loaded_shop = shop.with_shopify_session do
  ShopifyAPI::Shop.new(from_hash: shop_data)
end
loaded_shop.google_apps_login_enabled

Checklist:

• My commit message follow the pattern described in here
• I have performed a self-review of my own code.
• I have added tests that prove my fix is effective or that my feature works.
• I have updated the project documentation.
• I have added a changelog line.

[kirillplatonov]

cc @paulomarg

[paulomarg]

Yeah, this makes sense - that field is documented as a nullable boolean 👍

Tested it in an app, and it seems fine.

Thanks!