Update Microsoft.NET.Test.Sdk to 16.1.0 to match SDKs version in global.json

Author: hazzik

src/FluentNHibernate.Specs/FluentNHibernate.Specs.csproj

@@ -12,7 +12,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.1.0" />
     <PackageReference Include="System.Data.SqlClient" Version="4.4.3" />
     <PackageReference Include="FluentAssertions" Version="4.19.4" />
     <PackageReference Include="Machine.Specifications" Version="0.12.0" />

src/FluentNHibernate.Testing/FluentNHibernate.Testing.csproj

@@ -21,7 +21,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Data.Sqlite" Version="2.1.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.1.0" />
     <PackageReference Include="FakeItEasy" Version="4.3.0" />
     <PackageReference Include="FluentAssertions" Version="4.19.4" />
     <PackageReference Include="NUnit" Version="3.10.1" />