composer(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/main/ChangeLog-11.3.md)
- [Commits](sebastianbergmann/phpunit@11.2.0...11.3.0)

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

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

composer.json

@@ -26,7 +26,7 @@
     },
     "require-dev": {
         "orchestra/testbench": "^9.1",
-        "phpunit/phpunit": "^11.2"
+        "phpunit/phpunit": "^11.3"
     },
     "config": {
         "process-timeout": 0,