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)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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