📝 Update release notes

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 ## Latest Changes

+### Fixes
+
+* 🐛 Fix line splitting in `format_sse_event` to comply with SSE spec. PR [#15515](https://github.com/fastapi/fastapi/pull/15515) by [@Zawwarsami16](https://github.com/Zawwarsami16).
+
 ## 0.140.11 (2026-07-28)

 ### Fixes