[6.0] Update -swift-version to default to 6 for swift-tools-version 6#7531

shahmishal merged 1 commit intoswiftlang:release/6.0swiftlang/swift-package-manager:release/6.0from

bnbarham:cherry-6-when-tools-version-6bnbarham/swift-package-manager:cherry-6-when-tools-version-6Copy head branch name to clipboard