v3.1.2

What's Changed

• fix(langchain): do not stringify metadata unnecessarily by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1237
• chore: add good .env defaults by @nimarb in https://github.com/langfuse/langfuse-python/pull/1239
• fix(openai): add check for metadata NotGiven by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1240
• fix(scores): skip sampling if OTEL sampler not available by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1241
• fix(dataset-run-items): correctly typ datasetRunItems.list by @hassiebp in https://github.com/langfuse/langfuse-python/pull/1242

Full Changelog: https://github.com/langfuse/langfuse-python/compare/v3.1.1...v3.1.2