Update phpunit/phpunit requirement from ^12.3 to ^12.3 || ^13.0

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/13.0.5/ChangeLog-13.0.md)
- [Commits](sebastianbergmann/phpunit@12.3.0...13.0.5)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 13.0.5
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -28,7 +28,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^12.3",
+        "phpunit/phpunit": "^12.3 || ^13.0",
         "php-standard-library/psalm-plugin": "^2.2",
         "vimeo/psalm": "^6.13",
         "php-cs-fixer/shim": "^3.88"