Failure to load fonts in debian sid leads to all text being missing

### Steps to reproduce

When running element-desktop 1.12.0 in debian sid no text is displayed, making the UI unusable.

### Outcome

I get the following (abbreviated) output when running from CLI:

```
...

Opening main window
[2232:1006/182334.800058:ERROR:ui/gfx/platform_font_skia.cc:258] Could not find any font: DejaVu Sans, sans. Falling back to the default

...

[4218:1006/182336.927471:ERROR:third_party/blink/renderer/core/css/remote_font_face_source.cc:357] NOTREACHED hit.
[4218:1006/182336.927711:ERROR:third_party/blink/renderer/core/css/remote_font_face_source.cc:357] NOTREACHED hit.
[4218:1006/182336.929431:ERROR:third_party/blink/renderer/core/css/remote_font_face_source.cc:357] NOTREACHED hit.
[2232:1006/182336.993673:ERROR:ui/gfx/platform_font_skia.cc:258] Could not find any font: DejaVu Sans, sans. Falling back to the default
[4218:1006/182337.942555:ERROR:third_party/blink/renderer/core/css/remote_font_face_source.cc:357] NOTREACHED hit.
[4218:1006/182337.942819:ERROR:third_party/blink/renderer/core/css/remote_font_face_source.cc:357] NOTREACHED hit.
[4218:1006/182337.943009:ERROR:third_party/blink/renderer/core/css/remote_font_face_source.cc:357] NOTREACHED hit.
[4218:1006/182337.943190:ERROR:third_party/blink/renderer/core/css/remote_font_face_source.cc:357] NOTREACHED hit.

...
```

For clarity's sake, `fonts-dejavu` `fonts-dejavu-core` `fonts-dejavu-extra` `fonts-dejavu-mono` are installed. I fixed it by downgrading to 1.11.99 which was still in my apt cache

### Operating system

Debian Sid

### Application version

1.12.0

### How did you install the app?

https://packages.element.io/debian/

### Homeserver

matrix.org

### Will you send logs?

No