SwifterPM 0.8.12 fixes __MACOSX shadow bundles and streams resolve output

The pinned SwifterPM dependency is updated to 0.8.12, which strips __MACOSX/ AppleDouble shadow bundles from extracted binary archives. This fixes generation failures with Finder-zipped artifacts such as Plaid’s LinkKit. It also streams stdout and stderr from delegated swift package resolve runs so progress is visible instead of appearing stalled.