Update dependency bentools/iterable-functions to ^2.1.1

Author: renovate[bot]

composer.json

@@ -10,7 +10,7 @@
   ],
   "require": {
     "php": "^8.1",
-    "bentools/iterable-functions": "^2.1",
+    "bentools/iterable-functions": "^2.1.1",
     "psr/simple-cache": "^2.0",
     "react/async": "^4.0",
     "react/cache": "^1.2",