Bump off PHP 8.0, add support for next vonage jwt lib

[SecondeJK]

This PR drops support for PHP8.0 and adds in dependency bumps for JWTs

Motivation and Context

Continued evolution of the SDK

How Has This Been Tested?

Dependency changes require that the existing test suite passes.

Example Output or Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dcd9651) 79.01% compared to head (0afb280) 79.01%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #462   +/-   ##
=========================================
  Coverage     79.01%   79.01%           
  Complexity     2337     2337           
=========================================
  Files           218      218           
  Lines          6281     6281           
=========================================
  Hits           4963     4963           
  Misses         1318     1318           

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