Fix the self update for macOS so that the installer is executed#441

cmcgee1024 merged 5 commits intoswiftlang:release/1.1swiftlang/swiftly:release/1.1from

cmcgee1024:fix_self_update_macos_release_11cmcgee1024/swiftly:fix_self_update_macos_release_11Copy head branch name to clipboard