Add mosaicml/mpt-7b to eval queue

mosaicml/mpt-7b_eval_request_False_float16_Original.json

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+{"model": "mosaicml/mpt-7b", "base_model": "", "revision": "main", "private": false, "precision": "float16", "weight_type": "Original", "status": "PENDING", "submitted_time": "2023-08-22T14:23:23Z", "model_type": "\ud83d\udfe2 : pretrained"}