SwiftPackageIndex-Server: Build timeouts

Just recording this for reference. Last night builds timed out (1h limit) processing https://github.com/kiliankoe/emeal-server.

I’m not 100% sure I think it was both dev and prod - which would indicate there was a real problem.

This seems to have only affected 14 packages out of 64:

all other builds fail, and for good reason. All the ones I checked reported something like:

Message: "xcodebuild: error: Could not resolve package dependencies:
  because Regex 0.2.3..<1.1.2 contains incompatible tools version and no versions of Regex match the requirement 1.1.2..<2.0.0, Regex 0.2.3..<2.0.0 is forbidden.
And because root depends on Regex 1.1.0..<2.0.0, version solving failed.