Fix SwiftPM artifact extraction and streamed resolve output

The SwifterPM dependency is now updated to 0.8.12, which fixes two issues in the SwiftPM integration. Finder-zipped binary artifacts (for example, Plaid’s LinkKit) that include a __MACOSX shadow bundle no longer cause generation failures, because the shadow directory is stripped and skipped during artifact scanning. Additionally, output from delegated swift package resolve now streams through to the terminal so resolution progress is visible instead of appearing stalled.