chore: clean up changelog (#448)

Remove dev suffix from old version

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Rename `1.0.8-dev2` to `1.0.8` in `CHANGELOG.md`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
2453974. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: qued

CHANGELOG.md

@@ -6,7 +6,7 @@
 
 * Make OD model loading thread safe
 
-## 1.0.8-dev2
+## 1.0.8
 
 * Enhancement: Optimized `zoom_image` (codeflash)
 * Enhancement: Optimized `cells_to_html` for an 8% speedup in some cases (codeflash)