Bump Versions to PyTorch 1.8, torchvision 0.9, Lightning 1.2.1

[oke-aditya]

Let's do it !

This should clear the road block of #43 and we will be able to add all these.

cc @hassiahk

[oke-aditya]

I have left hints, @hassiahk it should be simple with it. (Testing is boring)

[codecov]

Codecov Report

Merging #86 (22d2950) into master (cd90979) will decrease coverage by 0.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #86      +/-   ##
==========================================
- Coverage   78.14%   77.91%   -0.24%     
==========================================
  Files          50       50              
  Lines        1588     1585       -3     
==========================================
- Hits         1241     1235       -6     
- Misses        347      350       +3     

Flag	Coverage Δ
unittests	77.91% <ø> (-0.24%)	⬇️

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Impacted Files	Coverage Δ
quickvision/models/detection/detr/model_factory.py	91.17% <0.00%> (-8.83%)	⬇️
quickvision/models/detection/detr/utils.py	38.88% <0.00%> (-3.22%)	⬇️
quickvision/losses/detr_loss.py	75.83% <0.00%> (-0.40%)	⬇️

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