Update dependency phpunit/phpunit to ~9.6.29

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| packagist  | phpunit/phpunit | 9.6.28 | 9.6.29 |

Author: renovate[bot]

composer.json

@@ -9,7 +9,7 @@
     ],
     "require": {
         "php": "~8.2.0 || ~8.3.0 || ~8.4.0",
-        "phpunit/phpunit": "~9.6.28"
+        "phpunit/phpunit": "~9.6.29"
     },
     "license": "MIT",
     "authors": [