Bump langchain from 0.2.1 to 0.3.7

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.2.1 to 0.3.7.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain==0.2.1...langchain==0.3.7)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -67,7 +67,7 @@ jsonpatch==1.33
 jsonpointer==2.4
 jsonschema==4.22.0
 jsonschema-specifications==2023.12.1
-langchain==0.2.1
+langchain==0.3.7
 langchain-anthropic==0.1.15
 langchain-aws==0.1.6
 langchain-core==0.2.3