Update dependency phpunit/phpunit to v9.6.7

Author: renovate[bot]

composer.json

@@ -29,7 +29,7 @@
         "laravel/sail": "1.13.6",
         "mockery/mockery": "1.5.0",
         "nunomaduro/collision": "5.11.0",
-        "phpunit/phpunit": "9.5.18"
+        "phpunit/phpunit": "9.6.7"
     },
     "autoload": {
         "psr-4": {