feat: Update to langchain-core 1.0 and deprecate python 3.9 #151
Description
langchain-core 1.0 removes python 3.9 as an allowed version.
Upgrade the library to 1.0 and remove python3.9 support.
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langchain-core 1.0 removes python 3.9 as an allowed version.
Upgrade the library to 1.0 and remove python3.9 support.