v0.4.55

What's Changed

• feat(py): Add background callback error hook by @jacoblee93 in https://github.com/langchain-ai/langsmith-sdk/pull/2176
• release(py): 0.4.55 by @jacoblee93 in https://github.com/langchain-ai/langsmith-sdk/pull/2177

Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.4.54...v0.4.55