chore: 🤖 Support v5 + v6 and test on PHP 8.3

Author: mpyw

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: [5.3, 5.4, 5.5, 5.6, '7.0', 7.1, 7.2, 7.3, 7.4, '8.0', 8.1, 8.2]
+        php: [5.3, 5.4, 5.5, 5.6, '7.0', 7.1, 7.2, 7.3, 7.4, '8.0', 8.1, 8.2, 8.3]
         flags: ['']
         include:
           - { php: 5.3, flags: --prefer-lowest }

.idea/.gitignore

@@ -25,7 +25,7 @@
     },
     "require": {
         "php": ">=5.3.3",
-        "sebastian/comparator": "^1.0 || ^2.0 || ^3.0 || ^4.0"
+        "sebastian/comparator": "^1.0 || ^2.0 || ^3.0 || ^4.0 || ^5.0 || ^6.0"
     },
     "require-dev": {
         "phpunit/phpunit": ">=4.8"