security: Update Langchain versions

[tianjing-li]

Updates langchain version in poetry - tested with Wiki retriever

AI Description

This PR updates the langchain and langchain-community packages to the latest versions, 0.2.17 and 0.2.19 respectively. The changes are made in the poetry.lock and pyproject.toml files.

• poetry.lock file:
  • Updates the langchain package version from 0.2.15 to 0.2.17.
  • Updates the langchain-community package version from 0.2.15 to 0.2.19.
  • Adds a new file hash for the cryptography package in the manylinux_2_34_x86_64.whl file.
• pyproject.toml file:
  • Updates the langchain package version from 0.2.15 to 0.2.17 in two places.
  • Updates the langchain-community package version from 0.2.15 to 0.2.19.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.84%. Comparing base (8d86c4e) to head (8ef5903).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #894   +/-   ##
=======================================
  Coverage   77.84%   77.84%           
=======================================
  Files         259      259           
  Lines       11177    11177           
=======================================
  Hits         8701     8701           
  Misses       2476     2476           

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