Add Slint 1.13 release announcement with live preview for Rust

Author: ogoffart

draft/2025-09-03-this-week-in-rust.md

@@ -44,6 +44,7 @@ and just ask the editors to select the category.
 ### Newsletters
 
 ### Project/Tooling Updates
+* [Slint 1.13 Released with Live-Preview for Rust and C++](https://slint.dev/blog/slint-1.13-released)
 
 ### Observations/Thoughts