build(deps): update cebe/php-openapi requirement from ^1.4 to ^1.5

Updates the requirements on [cebe/php-openapi](https://github.com/cebe/php-openapi) to permit the latest version.
- [Release notes](https://github.com/cebe/php-openapi/releases)
- [Commits](cebe/php-openapi@1.4.0...1.5.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": ">=7.4",
         "ext-json": "*",
-        "cebe/php-openapi": "^1.4",
+        "cebe/php-openapi": "^1.5",
         "fakerphp/faker": "^1.13",
         "league/openapi-psr7-validator": "^0.12 || ^0.14",
         "thecodingmachine/safe": "^1.1"