chore: remove phpcpd as abandoned

Author: keradus

dev-tools/composer.json

@@ -9,7 +9,6 @@
         "pdepend/pdepend": "^2.16.2",
         "phpmd/phpmd": "^2.15",
         "sebastian/finder-facade": "^1.1",
-        "sebastian/phpcpd": "^1.4.3",
         "theseer/fdomdocument": "^1.6.7"
     },
     "config": {