"[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())})
```

Start in main.js at the worker termination call shown in the issue. Update that call as described, then run the language server or its available checks and confirm that the DEP0132 warnings no longer appear in the LSP logs.

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