fix singlestep dpm tests

[yiyixuxu]

fix the failing singlestep scheduler tests

thanks to @gfaires to help identify this is only an issue with newer numpy version #9359

it comes down to this, this creates a numpy array in earlier versions (as expected), however it creates a pytorcn tensor in newer version - this is just really blizzard and I couln;t find relevant information about it

import numpy as np
import torch
# Print NumPy version
print(f"NumPy version: {np.__version__}")

ts = np.linspace(0, torch.tensor(999), 51)
print(type(ts))

[HuggingFaceDocBuilderDev]

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