Update PHPUnit and JsonMapper

Author: Programie

composer.json

@@ -17,11 +17,11 @@
     "minimum-stability": "stable",
     "require": {
         "php": ">=7.2",
-        "netresearch/jsonmapper": "^1.5",
+        "netresearch/jsonmapper": "^4.0",
         "ext-json": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.3",
-        "php-coveralls/php-coveralls": "^2.1"
+        "phpunit/phpunit": "^9.5",
+        "php-coveralls/php-coveralls": "^2.4"
     }
 }