feat(php): add 8.4 support

[ZNeumann]

Description

The PHP Agent is planned to release support for PHP 8.4 during the week of Jan 13.

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature / enhancement (non-breaking change which adds functionality)
• Security fix
• Bug fix (non-breaking change which fixes an issue)

Checklist:

• Documentation has been updated
• This change requires changes in testing:
  • unit tests
  • E2E tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.44%. Comparing base (16df151) to head (efbbfc4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #165   +/-   ##
=======================================
  Coverage   57.44%   57.44%           
=======================================
  Files          36       36           
  Lines        2914     2914           
=======================================
  Hits         1674     1674           
  Misses       1094     1094           
  Partials      146      146           

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