Fixes and updates, version 0.8.28

[benmanns]

This PR has a few things going on that I noticed while adding 0.8.28. I tried to keep each commit self contained and well described in the extended commit message, so feel free to review and exclude any for merging or leave a comment and I can rebase them out of this PR.

• I noticed 0.6.10 through 0.6.12 weren't in download.sh. I updated the range to include them for future full syncs.
• My hash for 0.8.24 is different, I think because the universal binary change must have happened after downloading the aarch64 version. Do double check that modifying this doesn't cause any issues because I'm not certain the full implications of updating it.
• I added jq and wget to the download.sh shell. I run a very minimal shell and load things in via nix and these aren't part of POSIX, so I thought it helpful to include in the nix shell since we're generating one anyways.
• My nix hash file ... command didn't work for symlinks. I'm running realpath on the file before hashing to ensure it always works.
• Finally, I added version 0.8.28 to the list, updated the ethereum/solc-bin/macosx-amd64/list.json revision, and updated CI.

Thanks for putting this flake together! It's helpful for keeping up-to-date with solc versions since nixpkgs does seem to lag behind a bit.

[hellwolf]

Thank you! I am glad it's been useful for you, too.

I will do a quick test run on my computer asap and merge this. Fwiw, CI currently is red, probably something trivial to fix; I will have a look later too.

[hellwolf]

CI passes soon. Will merge momentarily. Thanks!