Update novaunit

Author: mdpoulter

composer.json

@@ -23,10 +23,6 @@
         {
             "type": "composer",
             "url": "https://nova.laravel.com"
-        },
-        {
-            "type": "vcs",
-            "url": "https://github.com/laravel-shift/NovaUnit.git"
         }
     ],
     "require": {
@@ -36,7 +32,7 @@
         "laravel/nova": "^4.0"
     },
     "require-dev": {
-        "joshgaber/novaunit": "dev-l10-compatibility",
+        "joshgaber/novaunit": "^3.1",
         "laravel/pint": "^1.2",
         "mockery/mockery": "^1.3.3",
         "nunomaduro/collision": "^6.1 || ^7.0",