Update phpunit/phpunit requirement from ^10.0 to ^10.0 || ^11.0

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/11.4.2/ChangeLog-11.4.md)
- [Commits](sebastianbergmann/phpunit@10.0.0...11.4.2)

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

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

composer.json

@@ -25,6 +25,6 @@
         "veewee/xml": "^3.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.0"
+        "phpunit/phpunit": "^10.0 || ^11.0"
     }
 }