*This improvement is only included in [fbs Pro](https://build-system.fman.io/pro).*
This release makes `fbs sign` on Windows more robust with respect to flakiness in the underlying invocation of Microsoft's `signtool`. It also adds a new setting `windows_sign_server` that can be used to configure the timestamp server used for signing.
Specifically, this release makes errors of the following form less likely:
> SignTool Error: The specified timestamp server either could not be reached or returned an invalid response.
> SignTool Error: An error occurred while attempting to sign: C:\\....