Add EleutherAI/gpt-neox-20b to eval queue

EleutherAI/gpt-neox-20b_eval_request_False_float16_Original.json

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+{"model": "EleutherAI/gpt-neox-20b", "base_model": "", "revision": "main", "private": false, "precision": "float16", "weight_type": "Original", "status": "PENDING", "submitted_time": "2023-11-20T14:22:09Z", "model_type": "\ud83d\udfe2 : pretrained"}