[WIP] Force VS2019 as CMake generator

[Blackhex]

Attempt to fix #7682

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/7689

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❌ 3 New Failures, 2 Unrelated Failures

As of commit 5852757:

NEW FAILURES - The following jobs have failed:

• unittests-linux (3.10, linux.12xlarge, cpu) / linux-job (gh)
• unittests-macos (3.8, macos-m1-12) / macos-job (gh)
• unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)

BROKEN TRUNK - The following jobs failed but were present on the merge base 5178a2e:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• windows (windows.4xlarge, cpu) / windows-job (gh)
• windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh)

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[Blackhex]

Not needed at the moment.