[Dependabot] Update phpunit/phpunit requirement from 9.6.21 to 9.6.22 (…

…#1375)

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/9.6.22/ChangeLog-9.6.md)
- [Commits](sebastianbergmann/phpunit@9.6.21...9.6.22)

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

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

composer.json

@@ -49,7 +49,7 @@
         "phpstan/phpstan": "1.12.9",
         "phpstan/phpstan-phpunit": "1.4.0",
         "phpstan/phpstan-strict-rules": "1.6.1",
-        "phpunit/phpunit": "9.6.21",
+        "phpunit/phpunit": "9.6.22",
         "rawr/cross-data-providers": "2.4.0",
         "rawr/phpunit-data-provider": "3.3.0",
         "rector/rector": "1.2.10"