SchemaSmith v2.7.3

Fixed

• Building from source failed NuGet's audit on System.Security.Cryptography.Pkcs 9.0.18 — #505. Microsoft.Data.SqlClient brings the package in, and two advisories published on 2026-10-13 (GHSA-846f-f764-76mx, GHSA-2fmv-rv2c-59x7) turned every restore into an error under the repository's warnings-as-errors policy, a consumer referencing Schema.csproj by project included. The package is pinned to 9.0.21, and the shipped tools carry the patched assembly. Nothing else changed since v2.7.2.