libreoffice-still 24.8.4

[samford]

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This updates libreoffice-still to 24.8.4 (again), now that it has been officially released. As with libreoffice, the livecheck block is incorrectly returning 24.2.7 as the newest Still version because upstream hasn't updated the libreoffice.org Release Notes page yet.

This also updates the livecheck block to use the libreoffice check (inheriting the url and regex), along with the previous strategy block that uses the second-highest version. This means that we need to make sure that the libreoffice livecheck block always checks a page that lists both the latest Fresh and Still versions.

This depends on the related libreoffice PR (#200939), so I'm creating this as a draft until that's merged (and will rebase afterward).

[khipp]

@samford libreoffice-still-language-pack might also need a livecheck revision since it depends on this cask but returns version 25.2.0 (see #200953).

[samford]

@khipp Oh yeah, I meant to take care of the -language-pack casks but it was a bit late and I forgot, so thanks for surfacing this issue.

libreoffice-still-language-pack references libreoffice-still which references libreoffice and it looks like I overlooked something in the chained reference implementation (i.e., the former inherits the url and regex like it should but not the strategy block from libreoffice-still). I'll replace the cask reference in libreoffice-still as a short-term workaround (as part of downgrading the language pack to 24.8.4) but I'll look into why it's not working as expected (and make sure to expand test coverage to include this case).

I'll have a PR up to downgrade libreoffice-still-language-pack once I finish downloading the hundreds of files to compute the sha256 values 😭