chore: add engines field to package.json

semi-randomly selected node 14, everyone should be over that? not intended to be a breaking change

Author: mikehardy

package.json

@@ -57,5 +57,8 @@
   },
   "publishConfig": {
     "access": "public"
+  },
+  "engines": {
+    "node": ">=14"
   }
 }