Bump little snitch@5 to 5.8

[holser]

5.8 is compatible with MacOS 15.0 Sequioia

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[holser]

CI won't pass as cask checks the version in plist and fails as it gets version mismatch

[p-linnane]

This release is specific to Sequoia only, which is probably why the plist hasn't been updated to point everyone to it.

[holser]

I guess we should check https://sw-update.obdev.at/products/littlesnitch/releasenotes-swu-5.html instead of plist. Alternatively I can disable plist verification in Cask

[p-linnane]

The cask needs to be reworked to offer 5.8 on macOS Sequoia, and 5.7.6 for other macOS versions. Perhaps @samford can provide some insight on the best way to handle this. We should not remove the plist check simply because it is not working for this limited release.

[samford]

Checking the plist file aligns with what the app checks but it's not clear why they haven't added 5.8. The first-party download page for old releases and release notes for v5 both reference 5.8 but explain that it's only for Sequoia.

How we approach this depends on if upstream is going to continue creating 5.7.x versions for macOS versions lower than Sequoia or if 5.7.6 is the last pre-Sequoia release and new versions will all be 5.8+. Looking at the release notes for v4, they didn't release any 4.5.x versions after 4.6 introduced a Catalina requirement. The language is a bit different for 5.8 but it may be reasonable to assume that 5.7.6 is the last pre-Sequoia version and they will simply continue on from 5.8.

With that in mind, we can use a similar approach as little-snitch@4, where we use a skip livecheck block in the older macOS block. The tricky part here is that the plist file doesn't list 5.8 yet (only 5.7.6 and an old nightly). It may just be that they haven't updated the file yet but we can check the download page for older releases for the time being.

I'll push a commit in a moment to handle the version setup for older macOS versions.