Add Sao10K/Stheno-Mix-L2-20B to eval queue

Sao10K/Stheno-Mix-L2-20B_eval_request_False_float16_Original.json

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+{"model": "Sao10K/Stheno-Mix-L2-20B", "base_model": "TheBloke/Llama-2-13B-fp16", "revision": "main", "private": false, "precision": "float16", "weight_type": "Original", "status": "PENDING", "submitted_time": "2023-09-08T00:24:26Z", "model_type": "\ud83d\udd36 : fine-tuned"}