Update dependency phpunit/phpunit to ^11.5.50 [SECURITY]

| datasource | package         | from    | to      |
| ---------- | --------------- | ------- | ------- |
| packagist  | phpunit/phpunit | 11.5.49 | 11.5.50 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

composer.json

@@ -33,7 +33,7 @@
         "amphp/dns": "^2.4.0",
         "amphp/socket": "^2.3.1",
         "laminas/laminas-coding-standard": "~3.1.0",
-        "phpunit/phpunit": "^11.5.42",
+        "phpunit/phpunit": "^11.5.50",
         "psalm/plugin-phpunit": "^0.19.0",
         "sebastian/recursion-context": "^6.0.3",
         "vimeo/psalm": "^6.13.1"