Rebex .NET components R6.7: Fixed code-signing issue

From September 14^th to September 22^nd, 2022, DigiCert's timestamping authority (TSA) mistakenly used a timestamping certificate with a validity period of only one year. Unfortunately, this mistake means that code-signed Rebex assemblies from R6.6 release will no longer pass validation after February 28^th, 2024.

Therefore, Rebex customers should upgrade from R6.6 as soon as possible to take advantage of the new TSA certificate's full 11-year validity period.

For a detailed list of changes, see the release history.