remove php 7.4 from composer file

composer.json

@@ -4,7 +4,6 @@
 		"lsolesen/pel": "^0.9"
 	},
 	"require-dev": {
-		"php": "^7.4",
 		"php-parallel-lint/php-parallel-lint": "^1.0",
 		"php-parallel-lint/php-console-highlighter": "^0.5",
 		"squizlabs/php_codesniffer": "3.*",

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "dd1fffe86b059967ba5924a32273992f",
+    "content-hash": "ca1498a9efa5ac4dc59fada71549dfcc",
     "packages": [
         {
             "name": "lsolesen/pel",
@@ -428,8 +428,6 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": [],
-    "platform-dev": {
-        "php": "^7.4"
-    },
+    "platform-dev": [],
     "plugin-api-version": "2.0.0"
 }