Update dependency wyrihaximus/async-test-utilities to v14

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

composer.json

@@ -19,7 +19,7 @@
   },
   "require-dev": {
     "react-parallel/stubs": "^1.2.0",
-    "wyrihaximus/async-test-utilities": "^13.3.0",
+    "wyrihaximus/async-test-utilities": "^14.5.0",
     "wyrihaximus/makefiles": "^0.12.3",
     "wyrihaximus/ticking-promise": "^3.1.0"
   },