Use php for coverage runs

[ohmyfelix]

Summary

Switch the Makefile coverage target from phpdbg to php so this repository follows the org-wide coverage runner change tracked in contributte/contributte#73.

Motivation

phpdbg is being removed from Contributte coverage targets. This keeps reCAPTCHA aligned with the new standard and with the shared CI workflow expectations.

Changes

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

Testing

• Tests pass locally (make tests)
• Coverage runs locally
• CI passes

Local make coverage currently fails in this environment because the installed PHP does not have Xdebug or PCOV enabled and the change intentionally no longer uses PHPDBG.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.32%. Comparing base (f1fdf03) to head (d718ced).
⚠️ Report is 14 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (f1fdf03) and HEAD (d718ced). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (f1fdf03)	HEAD (d718ced)
	4	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #79      +/-   ##
==========================================
- Coverage   86.11%   79.32%   -6.79%     
==========================================
  Files           7        8       +1     
  Lines         144      179      +35     
==========================================
+ Hits          124      142      +18     
- Misses         20       37      +17     

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