v0.3.0dev2

What's Changed

• resolve more warnings in unit tests by @eyurtsev in https://github.com/langchain-ai/langserve/pull/752
• first pass at removing deprecated usaged by @eyurtsev in https://github.com/langchain-ai/langserve/pull/751
• update claude model in examples by @eyurtsev in https://github.com/langchain-ai/langserve/pull/750
• more run time warnings by @eyurtsev in https://github.com/langchain-ai/langserve/pull/753
• Update doc-string, remove unused function by @eyurtsev in https://github.com/langchain-ai/langserve/pull/754
• update serialization to work with older pydantic versions by @eyurtsev in https://github.com/langchain-ai/langserve/pull/756
• serialization fix for defaults by @eyurtsev in https://github.com/langchain-ai/langserve/pull/757
• Release 0.3.0dev2 by @eyurtsev in https://github.com/langchain-ai/langserve/pull/758

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