update downgrade script

Author: samsonasik

build/target-repository/composer.json

@@ -4,7 +4,7 @@
     "description": "Set of Symplify rules for PHPStan",
     "license": "MIT",
     "require": {
-        "php": "^7.2|^8.0",
+        "php": "^7.4|^8.0",
         "nette/utils": "^3.2.9 || ^4.0",
         "phpstan/phpstan": "^1.10.30",
         "webmozart/assert": "^1.11"