Update phpunit/phpunit requirement from ^9.6.5 to ^9.6.5 || ^10.0.0

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/10.5.16/ChangeLog-10.5.md)
- [Commits](sebastianbergmann/phpunit@9.6.5...10.5.16)

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

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

Author: dependabot[bot]

composer.json

@@ -23,7 +23,7 @@
     "doctrine/annotations": "^1.13 || ^2.0.1"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9.6.5",
+    "phpunit/phpunit": "^9.6.5 || ^10.0.0",
     "mouf/picotainer": "^1.1",
     "phpstan/phpstan": "^1.8",
     "php-coveralls/php-coveralls": "^2.1.0",