'custom-phone-provider' not available as a trigger

[chrisnellis]

Checklist

• I have looked into the README and have not found a suitable solution or answer.
• I have looked into the documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have upgraded to the latest version of this provider and the issue still persists.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Description

As of v13.1, custom-phone-provider doesn't seem to be available when creating either a auth0_trigger_actions or auth0_trigger_action resource

While this was added in #1152 , it may have been accidentally undone through merge conflicts with #1155

Expectation

custom-phone-provider is a valid trigger when creating an auth0_trigger_actions.

Reproduction

1. Given, Terraform provider version 1.13.1
2. When I create a auth0_trigger_actions resource with custom-phone-provider as a trigger, I get a failure

Auth0 Terraform Provider version

1.13.1

Terraform version

1.10.5