Bump Microsoft.NET.Test.Sdk from 17.12.0 to 17.13.0 (#312)

Author: dependabot[bot]

Directory.Packages.props

@@ -13,7 +13,7 @@
     <!-- Test -->
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.0.1" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.InMemory" Version="$(EFCoreVersion)" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="$(EFCoreVersion)" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Specification.Tests" Version="$(EFCoreVersion)" />