Langserve

* ci: add workflow dispatch to _release by eyurtsev in https://github.com/langchain-ai/langserve/pull/805

New Contributors
* Mingqi2 made their first contribution in https://github.com/langchain-ai/langserve/pull/792
* xxsl made their first contribution in https://github.com/langchain-ai/langserve/pull/798

**Full Changelog**: https://github.com/langchain-ai/langserve/compare/v0.3.0...v0.3.1

**Full Changelog**: https://github.com/langchain-ai/langserve/compare/v0.2.3...v0.3.0

What's Changed
* Update unit tests to catch up with langchain-core by eyurtsev in https://github.com/langchain-ai/langserve/pull/743
* upgrade to pydantic 2 by eyurtsev in https://github.com/langchain-ai/langserve/pull/744
* migrate examples to pydantic 2 by eyurtsev in https://github.com/langchain-ai/langserve/pull/745
* chat-playground: update to handle oneOf (resulted from pydantic upgrade) by eyurtsev in https://github.com/langchain-ai/langserve/pull/746
* update default playground to handle oneOf type by eyurtsev in https://github.com/langchain-ai/langserve/pull/747

**Full Changelog**: https://github.com/langchain-ai/langserve/compare/v0.3.0dev1...v0.3.0dev2

What's Changed
* Update unit tests to catch up with langchain-core by eyurtsev in https://github.com/langchain-ai/langserve/pull/743
* upgrade to pydantic 2 by eyurtsev in https://github.com/langchain-ai/langserve/pull/744
* migrate examples to pydantic 2 by eyurtsev in https://github.com/langchain-ai/langserve/pull/745
* chat-playground: update to handle oneOf (resulted from pydantic upgrade) by eyurtsev in https://github.com/langchain-ai/langserve/pull/746
* update default playground to handle oneOf type by eyurtsev in https://github.com/langchain-ai/langserve/pull/747

**Full Changelog**: https://github.com/langchain-ai/langserve/compare/v0.2.3...v0.3.0dev1