Update dependency phpunit/phpunit to ^11.5.28

| datasource | package         | from    | to      |
| ---------- | --------------- | ------- | ------- |
| packagist  | phpunit/phpunit | 11.5.27 | 11.5.28 |

Author: renovate[bot]

composer.json

@@ -33,7 +33,7 @@
     ],
     "require-dev": {
         "phpbench/phpbench": "^1.4.1",
-        "phpunit/phpunit": "^11.5.27"
+        "phpunit/phpunit": "^11.5.28"
     },
     "autoload": {
         "psr-4": {