⬆️ Update phpunit/phpunit requirement from ^9.5 to ^10.4

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/10.4.2/ChangeLog-10.4.md)
- [Commits](sebastianbergmann/phpunit@9.5.0...10.4.2)

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

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

composer.json

@@ -39,7 +39,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "^1.9",
-        "phpunit/phpunit": "^9.5",
+        "phpunit/phpunit": "^10.4",
         "vimeo/psalm": "^5.6"
     },
     "suggest": {