Update dependency eslint-plugin-functional to v9

Author: renovate[bot]

package.json

@@ -39,7 +39,7 @@
 		"@typescript-eslint/parser": "5.62.0",
 		"eslint": "8.57.1",
 		"eslint-config-prettier": "10.1.8",
-		"eslint-plugin-functional": "4.4.1",
+		"eslint-plugin-functional": "9.0.2",
 		"husky": "8.0.3",
 		"prettier": "3.6.2",
 		"typescript": "5.9.3"