Update MockQueryable.Sample.csproj

Author: Roman Titov

src/MockQueryable/MockQueryable.Sample/MockQueryable.Sample.csproj

@@ -11,6 +11,7 @@
   <ItemGroup>
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     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
+    <PackageReference Include="coverlet.msbuild" Version="6.0.4" PrivateAssets="All" />
     <!--<PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />-->
     <PackageReference Include="NUnit" Version="4.4.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="5.2.0">