Update half precision test cases to support Pytorch v1.12

[mert-kurttutan]

To resolve the issue #161

• Explicitly dictate device=cpu in test cases to prevent mixed device when running on local device
• Move half-precision test case into gpu_test.py since pytorch v1.12 does not
  support half precision on cpu

[codecov]

Codecov Report

Merging #165 (5585ea5) into main (c3216f6) will decrease coverage by 0.86%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #165      +/-   ##
==========================================
- Coverage   98.26%   97.39%   -0.87%     
==========================================
  Files           6        6              
  Lines         575      575              
==========================================
- Hits          565      560       -5     
- Misses         10       15       +5     

Impacted Files	Coverage Δ
torchinfo/torchinfo.py	97.24% <0.00%> (-2.30%)	⬇️

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[TylerYep]

Can you also add the Pytorch 1.12 tests for this? In the .github folder:

matrix:
        python-version: ["3.7", "3.8", "3.9"]
        pytorch-version: ["1.4.0", "1.5.1", "1.6.0", "1.7.1", "1.8", "1.9", "1.10", "1.11"]  # add "1.12"

[TylerYep]

Looks good, thanks!