"[DEP0132] DeprecationWarning" warnings in the current main.js

I'm using neovim with copilot. Current code of language server spam my logs with an annoying depreciation warnings in LSP logs (I'm using the copilot.lua though):

```
[ERROR][2025-07-04 16:10:21] ...p/_transport.lua:36 "rpc" "node" "stderr" "(node:32377) [DEP0132] DeprecationWarning: Passing a callback to worker.terminate() is deprecated. It returns a Promise instead.\n(node:32377) [DEP0132] DeprecationWarning: Passing a callback to worker.terminate() is deprecated. It returns a Promise instead.\n(node:32377) [DEP0132] DeprecationWarning: Passing a callback to worker.terminate() is deprecated. It returns a Promise instead.\n(node:32377) [DEP0132] DeprecationWarning: Passing a callback to worker.terminate() is deprecated. It returns a Promise instead.\n"
```

The could be easily fixed if we replace this piece of code in `main.js`:

```diff
- this.workers[i].worker.terminate(()=>{n++,n===this.workers.length&&(this.workers=[],r())})
+ this.workers[i].worker.terminate().then(()=>{n++,n===this.workers.length&&(this.workers=[],r())})
```

main.js にある、issue に示されている worker 終了呼び出しから始めます。その呼び出しを説明どおりに更新し、次に language server または利用可能なチェックを実行して、DEP0132 警告が LSP ログに表示されなくなったことを確認します。

索引モデルが issue の本文から書いたものです。