Bump langchain from 0.3.27 to 1.0.0

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.3.27 to 1.0.0.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain==0.3.27...langchain==1.0.0)

---
updated-dependencies:
- dependency-name: langchain
  dependency-version: 1.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@ amqp==5.3.1
 beautifulsoup4==4.14.2
 boto3==1.40.55
 imbalanced-learn==0.14.0
-langchain==1.0.0
+langchain==1.0.2
 langchain-anthropic==1.0.0
 langchain-classic==1.0.0
 langchain-community==0.4