TOML being highlighted as SQL

### Describe the bug

I have a Markdown code block labeled as "toml", but it's also getting classified as SQL, which is leading to incorrect highlighting.

### Steps to reproduce

- Create a slide with:

```toml
[[packages.wheels]]
name = "..."
upload-time = ...
url = "..."
path = "..."
size = ...
hashes = {...}
```

- Notice how "load-time" and "size" are in bold.

### Expected behavior

No bolding.

### Screenshots


### Environment

- Operating System:
- Python version:
- Software versions:
- Briefcase:
- Toga:
- ...

### Logs

```

```

### Additional context

_No response_

The issue names no source file or test; start by locating the Markdown code-block syntax-highlighting path and the language classification for `toml`. Reproduce the shown slide and verify that TOML is no longer also classified as SQL and that the affected values are not bolded.

Written by the indexing model from the issue text.