build(deps-dev): update phpunit/phpunit requirement

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/11.3.6/ChangeLog-11.3.md)
- [Commits](sebastianbergmann/phpunit@10.5.24...11.3.6)

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

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

Author: dependabot[bot]

composer.json

@@ -16,7 +16,7 @@
         "phpstan/phpstan": "^1.11.5",
         "phpstan/phpstan-phpunit": "^1.4.0",
         "phpstan/phpstan-strict-rules": "^1.6.0",
-        "phpunit/phpunit": "^10.5.24",
+        "phpunit/phpunit": "^11.3.6",
         "shipmonk/composer-dependency-analyser": "^1.5.3",
         "shipmonk/phpstan-rules": "^3.0",
         "slevomat/coding-standard": "^8.15.0"