remove warning for untyped requests

[pelletier197]

Changes

Please describe both what is changing and why this is important. Include:

I Added specific typing for void requests. This is important because first, IDEs usually give warnings when an object's type is not specified. It does not do anything at runtime because of type-erasure, but it makes it impossible for the IDE to know what is supposed to come out of that object.

This causes a small inconvenience when using the library. In my case, I wrapped the auth0 library with custom code that handles Rate-limiting better and automatically execute requests, which is why the dynamic typing is needed.

I was therefore forced to specify myself the Any type (because the library doesn't specify the Void)

Testing

Does not impact tests. It just removes warnings.

• This change adds test coverage
• This change has been tested on the latest version of the platform/language or why not

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors

[jimmyjames]

🎉 nice work! Thanks for this contribution!!