v4.5.1

What's Changed

• chore(ci): pin action version comments to immutable patch tags by @wochinge in https://github.com/langfuse/langfuse-python/pull/1636
• fix(experiments): flatten propagated metadata by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1641

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v4.5.0...v4.5.1