build(deps): update league/openapi-psr7-validator requirement from ^0.17 to ^0.18 (#100)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

composer.json

@@ -14,7 +14,7 @@
         "ext-json": "*",
         "cebe/php-openapi": "^1.6",
         "fakerphp/faker": "^1.19",
-        "league/openapi-psr7-validator": "^0.17",
+        "league/openapi-psr7-validator": "^0.18",
         "thecodingmachine/safe": "^1.3"
     },
     "require-dev": {