Bump langchain from 0.0.240 to 0.0.263

Bumps [langchain](https://github.com/hwchase17/langchain) from 0.0.240 to 0.0.263.
- [Release notes](https://github.com/hwchase17/langchain/releases)
- [Commits](https://github.com/hwchase17/langchain/compare/v0.0.240...v0.0.263)

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

Signed-off-by: dependabot[bot] <support@github.com>
Former-commit-id: ae97748311cc259ed22126bb17a7f719d0f3067a

requirements.txt

@@ -1,6 +1,6 @@
 # transformers
 # openai
-# langchain==0.0.240
+# langchain==0.0.263
 
 # torch
 # torchvision
@@ -114,7 +114,7 @@
 # simpleaichat
 
 transformers
-langchain==0.0.240
+langchain==0.0.263
 nest_asyncio
 pegasusx
 google-generativeai 

setup.py

@@ -19,7 +19,7 @@ setup(
   install_requires=[
         'transformers',
         'openai',
-        'langchain==0.0.240',
+        'langchain==0.0.263',
         # 'torch',
         # 'torchvision',
         # 'torchaudio',