doom upgrade: Open diff in browser -> Bad file descriptor

### What did you expect to happen?

When I run `doom upgrade` and agree to view the diff in my browser, I shouldn't see a strange warning about bad file descriptors.

### What actually happened?

Upon `doom upgrade` I'm asked if I'd like to see the diff in my browser. **If I have a browser open** it always sends me an error message that looks like this:


Although the page opens successfully in the browser anyway.

**If I never had a browser open in the first place** I see no such error.

### Describe your attempts to resolve the issue

_No response_

### Steps to reproduce

1. Have Emacs open and Doom on a non-recent commit.
2. Have a browser open (Firefox?)
3. Run `doom upgrade` (from a `vterm` is how I've been doing it).
4. Agree to view the diff.
5. See the error message.

### System Information

https://pastebin.com/NVpjkfwA