composer(deps-dev): Bump phpunit/phpunit from 9.6.18 to 9.6.19

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.18 to 9.6.19.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/9.6.19/ChangeLog-9.6.md)
- [Commits](sebastianbergmann/phpunit@9.6.18...9.6.19)

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

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

composer.json

@@ -39,7 +39,7 @@
     "ergebnis/phpunit-slow-test-detector": "^2.10.0",
     "fakerphp/faker": "^1.23.1",
     "infection/infection": "~0.26.6",
-    "phpunit/phpunit": "^9.6.18",
+    "phpunit/phpunit": "^9.6.19",
     "psalm/plugin-phpunit": "~0.19.0",
     "rector/rector": "^1.0.3",
     "symfony/filesystem": "^5.4.35",