Import QubitDevice from devices module

[albi3ro]

Context:

In PennyLane PR #6238 we will be deprecating top level access to QubitDevice.

Description of the Change:

Imports QubitDevice from pennylane.devices instead.

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[sc-71519]

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.70%. Comparing base (ee561f6) to head (a9a9567).
Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (ee561f6) and HEAD (a9a9567). Click for more details.

HEAD has 32 uploads less than BASE

Flag	BASE (ee561f6)	HEAD (a9a9567)
	40	8

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #897       +/-   ##
===========================================
- Coverage   96.60%   82.70%   -13.90%     
===========================================
  Files         212       24      -188     
  Lines       29301     2180    -27121     
===========================================
- Hits        28306     1803    -26503     
+ Misses        995      377      -618     

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[AmintorDusko]

As this is a straightforward change, and all other CIs were successful, I will approve and consider that we can merge it without the last 4 GPU tests.

[maliasadi]

Thanks @albi3ro! 🪂