chore(deps-dev): update behat/behat requirement in /tests/integration

Updates the requirements on [behat/behat](https://github.com/Behat/Behat) to permit the latest version.
- [Release notes](https://github.com/Behat/Behat/releases)
- [Changelog](https://github.com/Behat/Behat/blob/master/CHANGELOG.md)
- [Commits](https://github.com/Behat/Behat/compare/v3.15.0...v3.18.1)

---
updated-dependencies:
- dependency-name: behat/behat
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

tests/integration/composer.json

@@ -1,7 +1,7 @@
 {
     "require-dev": {
         "phpunit/phpunit": "~9",
-        "behat/behat": "~3.15.0",
+        "behat/behat": "~3.18.1",
         "guzzlehttp/guzzle": "7.9.2",
         "jarnaiz/behat-junit-formatter": "^1.3",
         "sabre/dav": "4.7.0",