Bump Microsoft.NET.Test.Sdk from 17.11.1 to 17.12.0 in /src (#1040)

Author: dependabot[bot]

src/Directory.Packages.props

@@ -17,7 +17,7 @@
     <PackageVersion Include="Microsoft.Data.SqlClient" Version="5.2.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="8.0.10" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.10" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="Polyfill" Version="7.4.1" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.144" />
     <PackageVersion Include="System.Text.Encodings.Web" Version="8.0.0" />