v0.4.34

What's Changed

• feat(js): Cache relevant env vars on client initialization for perf by @jacoblee93 in https://github.com/langchain-ai/langsmith-sdk/pull/2061
• Format openai agents span outputs by @angus-langchain in https://github.com/langchain-ai/langsmith-sdk/pull/2065

Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.4.33...v0.4.34