Prepare for PHP 8.4

Author: koehnlein

.github/workflows/phpunit.yml

@@ -16,6 +16,7 @@ jobs:
           - "8.1"
           - "8.2"
           - "8.3"
+          - "8.4"
         dependencies:
           - "highest"
           - "lowest"

composer.json

@@ -21,7 +21,7 @@
         }
     ],
     "require": {
-        "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
+        "php": "~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.0",
         "ext-json": "*",
         "codeception/codeception": "^5.0",
         "guzzlehttp/guzzle": "^6.1 || ^7.0"