revise unet fp16 variant

unet/diffusion_pytorch_model.fp16.bin

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:3fc0798c331faa6d86ca29d7b895fafa44b619bd5532d52f3586921a56aacf29
-size 1293690301
+oid sha256:f8501a7225e98f55302d01f65d81a786a942e24381e9c6e50aa6e16d0bab5d8b
+size 646920381

unet/diffusion_pytorch_model.fp16.safetensors

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:ded7f8745ae51e6e41ac3fdd3354b9ec3cb4b18c2e5b02539635e7b28bafee5f
-size 1293583616
+oid sha256:b844aff8b5994067e8ea495131e60212cf7dd945a02b683c3a7dce955ea44407
+size 646813304