fix(deps): update dependency llama_stack_client to v0.2.21

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This PR contains the following updates:

Package	Change	Age	Confidence
llama_stack_client	==0.2.20 -> ==0.2.21

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Release Notes

llamastack/llama-stack-client-python (llama_stack_client)

v0.2.21

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[dbasunag]

/approve

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