v4.0.6

What's Changed

• chore(deps): bump langchain-core from 1.2.21 to 1.2.22 by @dependabot[bot] in https://github.com/langfuse/langfuse-python/pull/1601
• feat(langchain): mark LangChain root observations in metadata by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1604

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v4.0.5...v4.0.6