Update dependency wyrihaximus/async-test-utilities to v12

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

composer.json

@@ -24,7 +24,7 @@
     "react-parallel/infinite-pool": "^3.1.0",
     "react-parallel/pool-tests": "^5.1.0",
     "react-parallel/stubs": "^1.2.0",
-    "wyrihaximus/async-test-utilities": "^10.5.0",
+    "wyrihaximus/async-test-utilities": "^12.0.0",
     "wyrihaximus/makefiles": "^0.7.15"
   },
   "minimum-stability": "dev",