Update maskedtensor_sparsity.py

[cpuhrsch]

See #2708

[pytorch-bot]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 1579121 with merge base 33f2d89 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

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[janeyx99]

let's go haha