Hi Zed team thank you for the awesome editor!

I recently stumbled upon a markdown sequence that seems to cause a crash

```md
-	[	] -
\
-
```

*easier to read escape characters below

```rust
let crash_input = "-\t[\t] -\r\\\n-"
println!("{}", crash_input)
```

## how to reproduce

1. copy the markdown above
2. save the file
3. `[shift]` + `[cmd]` + `p` to open the command palette
4. select `markdown: open preview`
5. crash

I've confirmed that the issue is a bug in pulldown-cmark version 12, and
has been resolved in version
[v0.13.0](https://github.com/pulldown-cmark/pulldown-cmark/releases/tag/v0.13.0)
and specifically fixed in
pulldown-cmark/pulldown-cmark#1017

this PR simply bumps the pulldown-cmark version in zed which resolves
the crash on my local machine.


## recording 



https://github.com/user-attachments/assets/dc77132f-0d43-40f3-9841-0bf34fe714fb


Release Notes:

- Fixes crash due to markdown parsing via bumping pulldown-cmark