chore(deps): bump the langchain group with 4 updates (#1521)

Bumps the langchain group with 4 updates: [@langchain/community](https://github.com/langchain-ai/langchainjs), [@langchain/core](https://github.com/langchain-ai/langchainjs), [@langchain/openai](https://github.com/langchain-ai/langchainjs) and [langchain](https://github.com/langchain-ai/langchainjs).


Updates `@langchain/community` from 0.3.39 to 0.3.40
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Changelog](https://github.com/langchain-ai/langchainjs/blob/main/release_workspace.js)
- [Commits](https://github.com/langchain-ai/langchainjs/commits/@langchain/community==0.3.40)

Updates `@langchain/core` from 0.3.43 to 0.3.44
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Changelog](https://github.com/langchain-ai/langchainjs/blob/main/release_workspace.js)
- [Commits](https://github.com/langchain-ai/langchainjs/commits/@langchain/core==0.3.44)

Updates `@langchain/openai` from 0.5.4 to 0.5.5
- [Release notes](https://github.com/langchain-ai/langchainjs/releases)
- [Changelog](https://github.com/langchain-ai/langchainjs/blob/main/release_workspace.js)
- [Commits](https://github.com/langchain-ai/langchainjs/commits/@langchain/openai==0.5.5)

Updates `langchain` from 0.3.20 to 0.3.21
- [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@0.3.20...0.3.21)

---
updated-dependencies:
- dependency-name: "@langchain/community"
  dependency-version: 0.3.40
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: langchain
- dependency-name: "@langchain/core"
  dependency-version: 0.3.44
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: langchain
- dependency-name: "@langchain/openai"
  dependency-version: 0.5.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: langchain
- dependency-name: langchain
  dependency-version: 0.3.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: langchain
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -33,9 +33,9 @@
     "@fortawesome/free-brands-svg-icons": "6.7.2",
     "@fortawesome/free-solid-svg-icons": "6.7.2",
     "@fortawesome/react-fontawesome": "0.2.2",
-    "@langchain/community": "0.3.39",
-    "@langchain/core": "0.3.43",
-    "@langchain/openai": "0.5.4",
+    "@langchain/community": "0.3.40",
+    "@langchain/core": "0.3.44",
+    "@langchain/openai": "0.5.5",
     "@million/lint": "1.0.14",
     "ai": "4.1.46",
     "babel-plugin-react-compiler": "19.0.0-beta-714736e-20250131",
@@ -47,7 +47,7 @@
     "gpt-tokenizer": "2.9.0",
     "he": "1.2.0",
     "jotai": "2.12.2",
-    "langchain": "0.3.20",
+    "langchain": "0.3.21",
     "markdown-to-txt": "2.0.1",
     "nanoid": "5.1.5",
     "next": "15.2.4",