Compilation failures on 5.10 with new typed throws

[0xTim]

The new typed throws are breaking builds on 5.10, even though they're supposed to be wrapped in a compiler check.

This is possibly related to swift-server/async-http-client#810.

See https://github.com/vapor/vapor/actions/runs/13922803636/job/38961918498?pr=3314 for an example build failure

[0xTim]

This is the issue tracking this on Swift swiftlang/swift#79285