chore(deps): Bump langchain from 0.2.3 to 0.2.7 in /examples/langchain/langchainpy-localai-example (#2824)

chore(deps): Bump langchain

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.2.3 to 0.2.7.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](https://github.com/langchain-ai/langchain/compare/langchain==0.2.3...langchain==0.2.7)

---
updated-dependencies:
- dependency-name: langchain
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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