fix(deps): update dependency llama-index to v0.12.16

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
llama-index (source)	0.12.14 -> 0.12.16

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Release Notes

run-llama/llama_index (llama-index)

v0.12.16

Compare Source

• Be more lenient with leading whitespaces emitted by some models when doing ReAct (#​17701)
• Fix user_msg vs chat_history AgentWorkflow inputs (#​17690)

v0.12.15

Compare Source

• Add error_on_tool_error param to FunctionCallingLLM.predict_and_call (#​17663)
• Get tool description from pydantic field (#​17679)
• fix: make ctx._events_buffer json-serializable (#​17676)
• feat: allow to exclude empty file simple directory reader (#​17656)
• improve markdown llm output parsing (#​17577)
• small typo fix in the default plan refine prompt (#​17644)

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