langgraph library replaced by langgraph-supervisor

[gurdeep330]

Hi @awmulyadi @lilijap @ansh-info @JaydeepBhat

In a recent PR, we introduced the newly released langgraph-supervisor library from LangGraph (GitHub link). This library requires the latest version of langgraph, which may not be compatible with the version we previously had.

As a result, once this PR is merged, langgraph will be replaced by langgraph-supervisor in the requirements.txt file. This new library will automatically handle the installation of langgraph and other necessary dependencies.

Please note that to avoid compatibility issues, you will need to delete your local environment and reinstall it rather than updating the existing one. This change will take effect only after the PR is merged.

Thx! 😊