Add Asterinas 0.16.0 announcement

Asterinas has been featured multiple times in This Week in Rust. This is the announcement of a new release.

Author: tatetian

draft/2025-08-20-this-week-in-rust.md

@@ -45,6 +45,8 @@ and just ask the editors to select the category.
 
 ### Project/Tooling Updates
 
+* [Announcing Asterinas 0.16.0](https://asterinas.github.io/2025/08/04/announcing-asterinas-0.16.0.html)
+
 ### Observations/Thoughts
 
 ### Rust Walkthroughs