Update dependency wyrihaximus/async-test-utilities to ^9.4.2

Author: reactphp-parallel-renovate-runner[bot]

composer.json

@@ -20,7 +20,7 @@
  "require-dev": {
  "react-parallel/stubs": "^1.2",
  "react/promise-timer": "^1.11",
- "wyrihaximus/async-test-utilities": "^9.3.0",
+ "wyrihaximus/async-test-utilities": "^9.4.2",
  "wyrihaximus/makefiles": "^0.5.0"
  },
  "autoload": {