upgraded varexported and phpunit

Author: oscarotero

composer.json

@@ -22,9 +22,9 @@
         "gettext/languages": "^2.3"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0",
+        "phpunit/phpunit": "^8.0|^9.0",
         "squizlabs/php_codesniffer": "^3.0",
-        "brick/varexporter": "^0.2.1",
+        "brick/varexporter": "^0.3.5",
         "friendsofphp/php-cs-fixer": "^3.2",
         "oscarotero/php-cs-fixer-config": "^2.0"
     },