Roll back dependency react/filesystem to 0.1.2@dev

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

composer.json

@@ -13,7 +13,7 @@
         "php": "^8.2",
         "react-parallel/contracts": "^2@dev",
         "react-parallel/react-parallel": "^2@dev",
-        "react/filesystem": "^0.2@dev"
+        "react/filesystem": "0.1.2@dev"
     },
     "require-dev": {
         "wyrihaximus/async-test-utilities": "^8.0.5"