Bump langchain from 0.0.66 to 0.2.19

Bumps [langchain](https://github.com/langchain-ai/langchainjs) from 0.0.66 to 0.2.19.
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Changelog](https://github.com/langchain-ai/langchainjs/blob/main/release_workspace.js)
- [Commits](langchain-ai/langchainjs@0.0.66...0.2.19)

---
updated-dependencies:
- dependency-name: langchain
  dependency-type: direct:production
...

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

package.json

@@ -60,7 +60,7 @@
     "graphql-tag": "^2.12.6",
     "husky": "^8.0.3",
     "jest": "^28.0.3",
-    "langchain": "^0.0.66",
+    "langchain": "^0.2.19",
     "lodash.deburr": "^4.1.0",
     "ms": "^2.0.0",
     "node-fetch": "^2.6.1",