Update phpunit/phpunit requirement from <10.0 to <12.0

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/11.2.6/ChangeLog-11.2.md)
- [Commits](sebastianbergmann/phpunit@1.0.0RC1...11.2.6)

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

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

composer.json

@@ -28,7 +28,7 @@
   "require-dev": {
     "infection/infection": "*",
     "phpstan/phpstan": "*",
-    "phpunit/phpunit": "<10.0",
+    "phpunit/phpunit": "<12.0",
     "roave/security-advisories": "dev-latest"
   },
   "autoload": {