Update phpunit/phpunit requirement from ^10.0.19 to ^10.0.19 || ^11.0.0

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@10.0.19...11.4.2)

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

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

Author: dependabot[bot]

composer.json

@@ -31,6 +31,6 @@
     "require-dev": {
         "php-soap/engine-integration-tests": "^1.9",
         "php-soap/xml": "^1.8",
-        "phpunit/phpunit": "^10.0.19"
+        "phpunit/phpunit": "^10.0.19 || ^11.0.0"
     }
 }