Update version.txt to 0.20.1

[atalman]

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[pytorch-bot]

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❌ 14 New Failures

As of commit d5e0a36 with merge base db5f8a0 ():

NEW FAILURES - The following jobs have failed:

• Build Linux Conda / pytorch/vision / upload / conda-py3_9-cpu (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Linux Conda / pytorch/vision / upload / conda-py3_9-cuda11_8 (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Linux Conda / pytorch/vision / upload / conda-py3_9-cuda12_1 (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Linux Conda / pytorch/vision / upload / conda-py3_9-cuda12_4 (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Build M1 Conda / pytorch/vision / conda-py3_9-cpu (gh)
  Library not loaded: @rpath/libarchive.19.dylib
• Build M1 Conda / pytorch/vision / upload / conda-py3_9-cpu (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/vision / upload / conda-py3_9-cpu (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/vision / upload / conda-py3_9-cuda11_8 (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/vision / upload / conda-py3_9-cuda12_1 (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/vision / upload / conda-py3_9-cuda12_4 (gh)
  ##[error]Unable to find any artifacts for the associated workflow
• Tests / unittests-macos (3.11, macos-m1-stable) / macos-job (gh)
  ##[error]fatal: couldn't find remote ref refs/pull/8694/merge
• Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job (gh)
  ##[error]fatal: couldn't find remote ref refs/pull/8694/merge
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)
  ##[error]fatal: couldn't find remote ref refs/pull/8694/merge
• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh)
  ##[error]fatal: couldn't find remote ref refs/pull/8694/merge

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