chore(deps): update dependency eslint-plugin-functional to v9

Author: renovate[bot]

packages/eslint-config-sylph-strict/package.json

@@ -55,7 +55,7 @@
   "peerDependencies": {
     "@eslint/js": "^9.x",
     "eslint": "^9.x",
-    "eslint-plugin-functional": "^6.x",
+    "eslint-plugin-functional": "^6.x || ^9.0.0",
     "typescript": "^5.x",
     "typescript-eslint": "^7.x"
   },