docs: fix 06-langchain-agents.ipynb

[KallieLev]

Problem

fixing user warning

Directly instantiating an SQLDatabaseChain with an llm is deprecated. Please instantiate with llm_chain argument or using the from_llm class method.

Solution

Describe the approach you took. Link to any relevant bugs, issues, docs, or other resources.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

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