Add support for Python 3.12 (#1873)

* Add support for Python 3.12

* chore: Update Python version to 3.11 and DuckDB dependency to 0.10.2

* chore: fix mistral components lint

* Update SQLAgent and SQLExecutor imports to use langchain_community utilities

* Update langchain import to langchain_community

* Update langchain import to langchain_community

* 📝 (langflow/__main__.py): Import warnings module to suppress warnings during app execution
📝 (langflow/api/v1/schemas.py): Update timestamp field default value to use datetime.now with timezone.utc
📝 (auth/utils.py): Ignore warnings related to datetime.utcnow when decoding JWT tokens and creating refresh tokens
📝 (models/flow/model.py): Update updated_at field default value to use lambda function with timezone.utc
📝 (models/user/model.py): Update create_at and updated_at field default values to use lambda function with timezone.utc