Fix issue on sample code - require usage

[tiagojsag]

Description

Code samples should use require('@auth0/s3')

Testing

This came up the moment I used the lib on one of my projects, so it should be pretty straightforward to test... just use the lib ;)

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master