Issue #3155546: composer.json require minimum PHP 7.3

composer.json

@@ -11,7 +11,7 @@
     }
   ],
   "require": {
-    "php": "7.3",
+    "php": ">=7.3",
     "drupal/core": "^8.8.0 || ^9.0",
     "drupal/domain": "^1.0@alpha"
   }