build: fix php minimum version constraint, paratest version

Author: chrisdicarlo

composer.json

@@ -16,11 +16,12 @@
         }
     ],
     "require": {
-        "php": "^8.0",
+        "php": "^8.1",
         "spatie/laravel-package-tools": "^1.16",
         "illuminate/contracts": "^10.0||^11.0||^12.0"
     },
     "require-dev": {
+        "brianium/paratest": "^7.3.1",
         "laravel/pint": "^1.14",
         "nesbot/carbon": "^2.63||^3.0",
         "nunomaduro/collision": "^7.10.0||^8.8.0",