Use php in coverage target

[ohmyfelix]

Summary

Switch the coverage Makefile target from phpdbg to php so this repository matches the org-wide coverage runner migration.

Motivation

This repository is part of contributte/contributte#73, which removes the phpdbg dependency from coverage targets.

Changes

• replace -p phpdbg with -p php in both branches of the coverage target in Makefile

Testing

• Tests pass locally (make tests)
• Coverage verified locally (make coverage currently fails because this environment has no Xdebug, PCOV, or PHPDBG coverage driver available)
• CI passes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.21%. Comparing base (33ec0d4) to head (a0d86c5).
⚠️ Report is 24 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
- Coverage   90.55%   90.21%   -0.34%     
==========================================
  Files         105      105              
  Lines        2413     2004     -409     
==========================================
- Hits         2185     1808     -377     
+ Misses        228      196      -32     

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