Bump phpunit/phpunit from 9.6.19 to 11.3.1

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.19 to 11.3.1.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.3.1/ChangeLog-11.3.md)
- [Commits](sebastianbergmann/phpunit@9.6.19...11.3.1)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

composer.json

@@ -26,7 +26,7 @@
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "^3",
-        "phpunit/phpunit": "^9.6",
+        "phpunit/phpunit": "^11.3",
         "phpmd/phpmd": "^2.4.3"
     },
     "repositories": [