Update eos-updater to remove libsoup-2.4 dependency
eos-updater does not get independent releases – it only gets tagged when Endless OS is released.
Track the master branch, and update to a snapshot that uses libsoup 3. Rearrange the element definition to match freedesktop-sdk for ease of comparison. Remove a now-unneeded patch.
See https://gitlab.com/freedesktop-sdk/freedesktop-sdk/-/merge_requests/16646.