Bump wyrihaximus/async-test-utilities from 5.0.3 to 5.0.6

Bumps [wyrihaximus/async-test-utilities](https://github.com/WyriHaximus/php-async-test-utilities) from 5.0.3 to 5.0.6.
- [Release notes](https://github.com/WyriHaximus/php-async-test-utilities/releases)
- [Commits](WyriHaximus/php-async-test-utilities@5.0.3...5.0.6)

---
updated-dependencies:
- dependency-name: wyrihaximus/async-test-utilities
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -15,7 +15,7 @@
     "react/filesystem": "^0.2@dev"
   },
   "require-dev": {
-    "wyrihaximus/async-test-utilities": "^5.0.3"
+    "wyrihaximus/async-test-utilities": "^5.0.6"
   },
   "autoload": {
     "psr-4": {