fix(node): lower the min. required node version to 18

package.json

@@ -82,7 +82,7 @@
     "vitest": "^1.5.2"
   },
   "engines": {
-    "node": ">=20.12.0",
-    "npm": ">=10.0.0"
+    "node": ">=18.10.0",
+    "npm": ">=8.11.0"
   }
 }