Fix Qwen3 example in readme

[pocman]

What does this PR do?

In the doc of Qwen3, on the Text Embeddings Inference (TEI) Usage , it's mentionned that float16 should be used.
This PR is fixing the readme
https://huggingface.co/Qwen/Qwen3-Embedding-0.6B#text-embeddings-inference-tei-usage

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