Update changelog for integrations/langfuse (#1956)

Co-authored-by: anakin87 <44616784+anakin87@users.noreply.github.com>

Author: HaystackBot

integrations/langfuse/CHANGELOG.md

@@ -1,10 +1,19 @@
 # Changelog
 
+## [unreleased]
+
+
+### 🧹 Chores
+
+- Pin langfuse<3.0.0 (#1904)
+- Align core-integrations Hatch scripts (#1898)
+- Update md files for new hatch scripts (#1911)
+
 ## [integrations/langfuse-v2.0.1] - 2025-06-02
 
 ### 🚀 Features
 
-- Use Langfuse local _to_openai_dict_format function to serialize messages (#1885)
+- Use Langfuse local to_openai_dict_format function to serialize messages (#1885)
 
 ### 🌀 Miscellaneous