build(deps): bump @langchain/community from 1.1.6 to 1.1.18

Bumps [@langchain/community](https://github.com/langchain-ai/langchainjs) from 1.1.6 to 1.1.18.
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Commits](https://github.com/langchain-ai/langchainjs/compare/@langchain/community@1.1.6...@langchain/community@1.1.18)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -16,7 +16,7 @@
     "@fontsource/inter": "^5.1.1",
     "@fontsource/roboto": "^5.1.1",
     "@langchain/classic": "^1.0.10",
-    "@langchain/community": "^1.1.6",
+    "@langchain/community": "^1.1.18",
     "@langchain/core": "^1.1.16",
     "@langchain/google-genai": "^2.1.12",
     "@langchain/openai": "^1.2.3",