Add Slint 1.12 release with WGPU/iOS Rust support

Author: tronical

draft/2025-06-18-this-week-in-rust.md

@@ -39,6 +39,7 @@ and just ask the editors to select the category.
 ### Newsletters
 
 ### Project/Tooling Updates
+ * [Slint 1.12 Released with WGPU Support, iOS Port, and Figma Variables Integration](https://slint.dev/blog/slint-1.12-released)
 
 ### Observations/Thoughts