SwifterPM 0.8.12: skip __MACOSX shadows and stream resolve output

Bumps SwifterPM to 0.8.12, bringing two fixes. Extracted archives no longer carry the __MACOSX AppleDouble sidecar created by Finder-zipped artifacts, so packages such as Plaid’s LinkKit generate successfully instead of aborting on a shadow .xcframework that sorts higher than the real one. Swift package resolve output is now streamed through during delegated resolution, so progress is visible instead of appearing stalled.