Update dependency wyrihaximus/async-test-utilities to v9

Author: renovate[bot]

composer.json

@@ -33,7 +33,7 @@
     },
     "require-dev": {
         "phpstan/phpstan-phpunit": "^0.12.22",
-        "wyrihaximus/async-test-utilities": "^4.2.2"
+        "wyrihaximus/async-test-utilities": "^9.4.1"
     },
     "autoload": {
         "psr-4": {