Remove coverage target using deprecated phpdbg

phpdbg was removed in PHP 8.3+. Coverage is handled by codecov.io.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: fain182

Makefile

@@ -31,8 +31,6 @@ phar: ## it creates phar
 outdated:
 	composer outdated
 
-coverage: ## it launches coverage
-	phpdbg -qrr ./bin/phpunit --coverage-html build/coverage
 
 csfix: ## it launches cs fix
 	PHP_CS_FIXER_IGNORE_ENV=1 bin/php-cs-fixer fix -v