update dependencies for Laravel 6

Author: michaeldyrynda

composer.json

@@ -3,13 +3,13 @@
   "description": "A package to override Laravel migrations to more efficiently store UUID fields in your database",
   "type": "utility",
   "require": {
-    "php": ">=5.6.4",
-    "illuminate/container": "~5.4",
-    "illuminate/database": "~5.4"
+    "php": "^7.2",
+    "illuminate/container": "^6.0",
+    "illuminate/database": "^6.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "~5.7",
-    "mockery/mockery": "~0.9.4"
+    "phpunit/phpunit": "^8.0",
+    "mockery/mockery": "^1.2.3"
   },
   "autoload": {
     "psr-4": {