Add PGM-Extra (v1.2.2) entry for 2025-12-03 Draft

Author: rpunkfu

draft/2025-12-03-this-week-in-rust.md

@@ -44,6 +44,7 @@ and just ask the editors to select the category.
 ### Newsletters
 
 ### Project/Tooling Updates
+* [PGM-Extra](https://github.com/itsfoxstudio/pgm-extra-rs/releases/tag/v1.2.2) - High-performance learned index structures for Rust by [Fox Studio](https://github.com/itsfoxstudio)
 
 ### Observations/Thoughts