fix: change php dependency

Author: lefuturiste

composer.json

@@ -10,13 +10,13 @@
         }
     ],
     "require": {
-        "php": "^7.4",
+        "php": ">=7.4",
         "ext-json": "*",
         "ext-sockets": "*",
         "clue/socket-raw": "^1.4"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.4"
+        "phpunit/phpunit": ">=7.4"
     },
     "autoload": {
         "psr-4": {