Update to use v3.0 of firebase/php-jwt

[jeffisfast]

Hello,

The current library is using an old version of the firebase/php-jwt library, which is now out of date. Can you update your software to use the current version (v3.0)?

Here is output from composer that shows the problem when I try to include the "firebase/php-jwt":"~3.0":

$ ./composer.phar update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- Installation request for auth0/auth0-php ~2.0 -> satisfiable by auth0/auth0-php[2.0.0].
- auth0/auth0-php 2.0.0 requires firebase/php-jwt ~2.2 -> no matching package found.

Potential causes:

• A typo in the package name
• The package is not available in a stable-enough version according to your minimum-stability setting
  see https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion for more details.

Read https://getcomposer.org/doc/articles/troubleshooting.md for further common problems.

[glena]

I am releasing 2.1.0 with this change.
Thanks :)

[github-actions]

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