chore: update kv.ts's imports

Author: jviide

src/api/kv.ts

@@ -1,5 +1,5 @@
 import * as v from "@badrap/valita";
-import { type Client, HTTPError } from "./client.js";
+import { type Client, HTTPError } from "./client.ts";
 
 type KvKey = (number | string | boolean)[];