Update phpunit/phpunit requirement from ^10.5 to ^11.4 (#3)

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/11.4.3/ChangeLog-11.4.md)
- [Commits](sebastianbergmann/phpunit@10.5.0...11.4.3)

---
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

@@ -17,7 +17,7 @@
         "psr/container": "^2.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.5",
+        "phpunit/phpunit": "^11.4",
         "mockery/mockery": "^1.4",
         "squizlabs/php_codesniffer": "^3.11",
         "noem/composer-file-embed": "dev-master",