chore(deps-dev): Bump phpunit/phpunit from 9.6.7 to 9.6.9

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.7 to 9.6.9.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/9.6.9/ChangeLog-9.6.md)
- [Commits](sebastianbergmann/phpunit@9.6.7...9.6.9)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Diff for: composer.json

@@ -20,7 +20,7 @@
 		"filp/whoops": "~2.0",
 		"mockery/mockery": "1.5.1",
 		"phpspec/phpspec": "^7.0",
-		"phpunit/phpunit": "9.6.7",
+		"phpunit/phpunit": "9.6.9",
 		"symfony/css-selector": "5.*",
 		"symfony/dom-crawler": "5.*",
 		"laravel/browser-kit-testing": "^6",