Useless ext-json requirement #791

Checklist

• This can be reproduced in the quickstart sample application.
• I have reviewed the README.md and have not found a solution.
• I have reviewed the EXAMPLES.md and have not found a solution.
• I have searched previous issues and have not found a solution.
• I have searched the Auth0 Community and have not found a solution.
• I agree to adhere to the Auth0 General Contribution Guidelines.
• I agree to uphold the Auth0 Code of Conduct.

SDK Version

8.7

PHP Version

PHP 8.2

Description

The requirement was probably left when the support for PHP 7 was dropped. PHP 8 has built-in json functionality, so the extension is currently inside the core itself

How can we reproduce this issue?

No need to reproduce