What's Changed
* infra: disable pypi release attestations by efriis in https://github.com/langchain-ai/langchain-upstage/pull/29
* infra: use artifact v4 in release pipeline by efriis in https://github.com/langchain-ai/langchain-upstage/pull/30
* infra: use artifact v4 in mark-release by efriis in https://github.com/langchain-ai/langchain-upstage/pull/31
* change standard tests to pypi by efriis in https://github.com/langchain-ai/langchain-upstage/pull/32
* Update Solar Pro Tokenizer by inahjeon in https://github.com/langchain-ai/langchain-upstage/pull/35
* bump version 0.3.0 -> 0.4.0rc0 by inahjeon in https://github.com/langchain-ai/langchain-upstage/pull/36
* fix: remove param output_type by e7217 in https://github.com/langchain-ai/langchain-upstage/pull/33
* [SAAS-489] fix test by inahjeon in https://github.com/langchain-ai/langchain-upstage/pull/38
* [SaaS-489] Fix integration test by inahjeon in https://github.com/langchain-ai/langchain-upstage/pull/39
New Contributors
* inahjeon made their first contribution in https://github.com/langchain-ai/langchain-upstage/pull/35
* e7217 made their first contribution in https://github.com/langchain-ai/langchain-upstage/pull/33
**Full Changelog**: https://github.com/langchain-ai/langchain-upstage/compare/libs/upstage/v0.3.0...libs/upstage/v0.4.0rc2