docs: update changelog for integrations/langfuse (#1888)

* Update changelog for integrations/langfuse

* Update CHANGELOG.md

---------

Co-authored-by: vblagoje <458335+vblagoje@users.noreply.github.com>
Co-authored-by: Vladimir Blagojevic <dovlex@gmail.com>

Author: HaystackBot

integrations/langfuse/CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## [integrations/langfuse-v2.0.1] - 2025-06-02
+
+### 🚀 Features
+
+- Use Langfuse local _to_openai_dict_format function to serialize messages (#1885)
+
+### 🌀 Miscellaneous
+
+- Feat: Add detailed tracing for GoogleGenAIChatGenerator (#1887)
+
 ## [integrations/langfuse-v2.0.0] - 2025-05-27
 
 ### 🌀 Miscellaneous