Use bun when bunx is used

### Pre-flight checklist

- [x] I have read the [contribution documentation](https://github.com/electron/forge/blob/main/CONTRIBUTING.md) for this project.
- [x] I agree to follow the [code of conduct](https://github.com/electron/electron/blob/main/CODE_OF_CONDUCT.md) that this project uses.
- [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

### Problem description

I tried `bunx create-electron-app@latest my-new-app --template=vite-typescript electron-transparent-window` & it still used `npm install`.

### Proposed solution

`bun` works decently now with Electron. Would love support for it.

### Alternatives considered

-

### Additional information

_No response_