fix saving versions on windows

[bjarzemb]

Before:

>python -c "import torchvision; print(torchvision.__version__)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: module 'torchvision' has no attribute '__version__'

After:

>python -c "import torchvision; print(torchvision.__version__)"
0.20.0a0+6279faa

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8792

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure

As of commit 33ee3d7 with merge base a9a726a ():

NEW FAILURE - The following job has failed:

• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh)
  ##[error]Process completed with exit code 1.

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[NicolasHug]

Thanks @bjarzemb

[NicolasHug]

@bjarzemb please make sure to sign the CLA so I can merge this PR :) !
code.facebook.com/cla