Bump @langchain/community from 1.1.5 to 1.1.18

Bumps [@langchain/community](https://github.com/langchain-ai/langchainjs) from 1.1.5 to 1.1.18.
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Commits](https://github.com/langchain-ai/langchainjs/compare/@langchain/community@1.1.5...@langchain/community@1.1.18)

---
updated-dependencies:
- dependency-name: "@langchain/community"
  dependency-version: 1.1.18
  dependency-type: direct:production
...

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Author: dependabot[bot]