feature: @putout/cli-ruler: drop support of node < 20

Author: coderaiser

packages/cli-ruler/package.json

@@ -31,7 +31,6 @@
     "cli"
   ],
   "devDependencies": {
-    "@putout/eslint-flat": "^3.0.0",
     "c8": "^10.0.0",
     "eslint": "^9.0.0",
     "eslint-plugin-n": "^17.0.0",
@@ -43,7 +42,7 @@
   },
   "license": "MIT",
   "engines": {
-    "node": ">=16"
+    "node": ">=20"
   },
   "publishConfig": {
     "access": "public"