quicklook-video: Add v2 for older macOS

[injust]

v3 is supported on Sequoia (the latest release is an exception), but doesn't work in practice.

Marginal/QuickLookVideo#201 (comment):

The APIs that 3.x uses to support thumbnails are supposed to work on macOS 15 but don't work in practice, so you're unlikely to see any thumbnails at all. Please use version 2.x.

Future (and previous) v3 releases will support Sequoia though, so add v2 to the cask for macOS versions between Monterey and Sonoma.

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[injust]

You know what, it's probably better to hold this PR until the next v3 release that supports Sequoia again, just to avoid churn.

Right now, Sequoia users already get an error because the latest version is Tahoe-or-newer.

[injust]

Failure seems correct, will mark this as a draft and come back when there's a new v3 release.