update composer.json for compatibility with php >=8.1

Author: Surfoo

composer.json

@@ -37,11 +37,11 @@
         "php-http/mock-client": "^1.6",
         "php-parallel-lint/php-parallel-lint": "~1.3",
         "phpstan/phpstan": "^2.1",
-        "phpunit/php-code-coverage": "^12.0",
-        "phpunit/phpunit": "^12.0",
+        "phpunit/php-code-coverage": "^10.0 | ^12.0",
+        "phpunit/phpunit": "^10.0 | ^12.0",
         "rector/rector": "^2.0",
         "squizlabs/php_codesniffer": "~3.5",
-        "symfony/var-dumper": "^7.0"
+        "symfony/var-dumper": "^6.0 | ^7.0"
     },
     "scripts": {
         "php-cs-fixer": "php-cs-fixer fix",