Composer: Update phpunit/phpunit requirement from ^4.5 || ^5.0 || ^6.…

…0 || ^7.0 || ^8.0 || ^9.0 to ^4.5 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.0 || ^11.0

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

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

composer.json

@@ -30,7 +30,7 @@
         "php-parallel-lint/php-console-highlighter": "^1.0",
         "phpcsstandards/phpcsdevcs": "^1.1.6",
         "phpcsstandards/phpcsdevtools": "^1.2.1",
-        "phpunit/phpunit": "^4.5 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.0"
+        "phpunit/phpunit": "^4.5 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.0 || ^11.0"
     },
     "extra": {
         "branch-alias": {