Update required_providers after change in b6d7bf1

[tpdownes]

#626 should have included an update to the required_providers. Without this, a terraform root module that makes use of this module will not know that it needs to download the GA google provider during terraform init.

Additionally, #626 broke the ability to successfully pass a provider because they no longer match the correct type. For example, this in 11.2.1

  providers = {
    google-beta = google-beta.budget
  }

will not continue to work even if you modify it to something like

  providers = {
    google = google-beta.budget
  }

because the correct type of provider (google) is not being passed. The Billing Budget API prohibits end user credentials for authentication for a number of actions so this ability is somewhat important in the module.

[comment-bot-dev]

Thanks for the PR! 🚀
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[tpdownes]

Thanks. Sorry for the inadvertent mistake in #626. Learned something!