AC-2841: Reverted removal of PHP7.4 support

Author: faizan-shk

composer.json

@@ -7,7 +7,7 @@
     "AFL-3.0"
   ],
   "require": {
-    "php": "~8.1.0||~8.2.0",
+    "php": "~7.3.0||~7.4.0||~8.0.0||~8.1.0||~8.2.0",
     "composer/composer": "^2.0",
     "composer-plugin-api": "^1.0 || ^2.0"
   },

src/Magento/ComposerRootUpdatePlugin/composer.json

@@ -8,7 +8,7 @@
     "AFL-3.0"
   ],
   "require": {
-    "php": "~8.1.0||~8.2.0",
+    "php": "~7.3.0||~7.4.0||~8.0.0||~8.1.0||~8.2.0",
     "composer/composer": "^1.0 || ^2.0",
     "composer-plugin-api": "^1.0 || ^2.0"
   },