Fix/ar-tutorial

[jdb78]

This PR fixes a device issue for the 'ar' tutorial where tensors were on different devices if a "mps" device is present leading to an error.

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All modified and coverable lines are covered by tests ✅

Project coverage is 90.14%. Comparing base (e2bf3fd) to head (dbeb32d).

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@@           Coverage Diff           @@
##           master    #1655   +/-   ##
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  Coverage   90.14%   90.14%           
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  Files          32       32           
  Lines        4780     4780           
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  Hits         4309     4309           
  Misses        471      471           

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cpu	90.14% <ø> (ø)
pytest	90.14% <ø> (ø)

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[fkiraly]

I see - any suggestions on how we test this?

I suppose we know that MPS devices are not present on macos-latest by virtue of this?
#1596

So we ought to run the notebooks on macos-latest as well?