📝 Update release notes

[skip ci]

docs/en/docs/release-notes.md

@@ -11,6 +11,10 @@ hide:
 
 * 🐛 Fix truncating the model's description with form feed (`\f`) character for Pydantic V2. PR [#13698](https://github.com/fastapi/fastapi/pull/13698) by [@YuriiMotov](https://github.com/YuriiMotov).
 
+### Refactors
+
+* ✅ Simplify tests for `validate_response_recursive`. PR [#13507](https://github.com/fastapi/fastapi/pull/13507) by [@valentinDruzhinin](https://github.com/valentinDruzhinin).
+
 ### Upgrades
 
 * ⬆️ Update ReDoc to version 2.x. PR [#9700](https://github.com/fastapi/fastapi/pull/9700) by [@joakimnordling](https://github.com/joakimnordling).