📝 Update release notes

[skip ci]

docs/en/docs/release-notes.md

@@ -7,6 +7,10 @@ hide:
 
 ## Latest Changes
 
+### Features
+
+* ✨ Serialize JSON response with Pydantic (in Rust), when there's a Pydantic return type or response model. PR [#14962](https://github.com/fastapi/fastapi/pull/14962) by [@tiangolo](https://github.com/tiangolo).
+
 ## 0.129.2
 
 ### Internal