Support symfony/options-resolver:^6.0 (GitLabPHP#677)

Author: endroid

composer.json

@@ -34,7 +34,7 @@
         "psr/http-client-implementation": "^1.0",
         "psr/http-factory-implementation": "^1.0",
         "psr/http-message": "^1.0",
-        "symfony/options-resolver": "^3.4 || ^4.0 || ^5.0",
+        "symfony/options-resolver": "^3.4 || ^4.0 || ^5.0 || ^6.0",
         "symfony/polyfill-php80": "^1.17"
     },
     "require-dev": {