fixed test for windows by closing the created temporary files (#1662)

[fmassa]

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[facebook-github-bot]

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[codecov-io]

Codecov Report

Merging #1687 into fbsync will decrease coverage by 65.65%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           fbsync   #1687       +/-   ##
==========================================
- Coverage   65.65%      0%   -65.66%     
==========================================
  Files          90      90               
  Lines        7085    7085               
  Branches     1075    1075               
==========================================
- Hits         4652       0     -4652     
- Misses       2126    7085     +4959     
+ Partials      307       0      -307

Impacted Files	Coverage Δ
torchvision/models/quantization/__init__.py	0% <0%> (-100%)	⬇️
torchvision/ops/boxes.py	0% <0%> (-100%)	⬇️
torchvision/datasets/samplers/__init__.py	0% <0%> (-100%)	⬇️
torchvision/ops/_register_onnx_ops.py	0% <0%> (-100%)	⬇️
torchvision/models/__init__.py	0% <0%> (-100%)	⬇️
torchvision/models/segmentation/deeplabv3.py	0% <0%> (-100%)	⬇️
torchvision/io/__init__.py	0% <0%> (-100%)	⬇️
torchvision/models/segmentation/fcn.py	0% <0%> (-100%)	⬇️
torchvision/ops/__init__.py	0% <0%> (-100%)	⬇️
torchvision/models/segmentation/__init__.py	0% <0%> (-100%)	⬇️
... and 80 more

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