Swift: Update to Swift 6.1.3

[jketema]

The DCA experiment (__3) is a bit messy, but doesn't give me reason for concern.

[Copilot]

Pull Request Overview

This PR updates the Swift toolchain from an earlier version to Swift 6.1.3, including both the prebuilt binaries and resource directories for macOS and Linux platforms.

• Updated Swift prebuilt binaries and resource directories for both macOS and Linux
• Added change notes documenting the Swift 6.1.3 update
• Updated binary checksums and file sizes to reflect the new Swift version

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
swift/third_party/resources/swift-prebuilt-macos.tar.zst	Updated macOS Swift prebuilt binary with new checksum and size
swift/third_party/resources/swift-prebuilt-linux.tar.zst	Updated Linux Swift prebuilt binary with new checksum and size
swift/third_party/resources/resource-dir-macos.zip	Updated macOS resource directory with new checksum and size
swift/third_party/resources/resource-dir-linux.zip	Updated Linux resource directory with new checksum and size
swift/ql/lib/change-notes/2025-09-08-swift-6.1.3.md	Added change notes documenting the Swift 6.1.3 update

[geoffw0]

Yep, 4/15 projects failing to build is concerning, though the errors are in the "before" runs as much as the "after" so very likely unrelated to these changes. I see that runs 1 and 2 are worse. Do you have any idea what's going on?

[jketema]

For MovieSwiftUI, bark, and Tofu it seems to the connection to the runner was lost. This seems to happen quite a lot nowadays, also integration tests. This looks like an infrastructure problem.

For Swiftmazing it looks like the the used version of xcodegen is no longer compatible with the XCode 14 we're targeting, and XCode 15 is not (and cannot be) installed on the macOS 13 runners we're using.

[jketema]

You want to ignore the DCA runs marked __1 and __2 that's me messing with some local DCA changes.

[geoffw0]

For Swiftmazing it looks like the the used version of xcodegen is no longer compatible with the XCode 14 we're targeting, and XCode 15 is not (and cannot be) installed on the macOS 13 runners we're using.

So this needs fixing in the DCA config somehow? Let me know if I can help with that.

[jketema]

So this needs fixing in the DCA config somehow? Let me know if I can help with that.

Yes, I opened an internal issue for this.

[geoffw0]

Great, thanks!