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/11.2.6/ChangeLog-11.2.md)
- [Commits](sebastianbergmann/phpunit@9.3.3...11.2.6)

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

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

composer.json

@@ -30,7 +30,7 @@
         "pestphp/pest-plugin-livewire": "^1.0",
         "pestphp/pest-plugin-mock": "^1.0",
         "pestphp/pest-plugin-parallel": "^1.0.0",
-        "phpunit/phpunit": "^9.3.3"
+        "phpunit/phpunit": "^11.2.6"
     },
     "autoload": {
         "psr-4": {