remove dev dependencies

composer.json

@@ -36,13 +36,6 @@
     "mika56/spfcheck": "^1.1.7",
     "beberlei/assert": "^3.3"
   },
-  "require-dev": {
-    "php": "^7.4",
-    "phpunit/phpunit" : "^9.5",
-    "friendsofphp/php-cs-fixer": "^3.9",
-    "phpstan/phpstan": "^1.8",
-    "boxblinkracer/phpunuhi": "^1.12"
-  },
   "extra": {
     "oxideshop": {
       "blacklist-filter": [