v0.4.19

What's Changed

• release(js): 0.3.64 by @jacoblee93 in https://github.com/langchain-ai/langsmith-sdk/pull/1964
• fix(py): Disable API key warnings if tracing is disabled by @jacoblee93 in https://github.com/langchain-ai/langsmith-sdk/pull/1965
• fix(python): Alleviate memory pressue from zstd flush by @angus-langchain in https://github.com/langchain-ai/langsmith-sdk/pull/1966

Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.4.18...v0.4.19