Bump Microsoft.NET.Test.Sdk in /tests/NLog.UnitTests (#3385)

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 16.0.1 to 16.1.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v16.0.1...v16.1.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

tests/NLog.UnitTests/NLog.UnitTests.csproj

@@ -46,7 +46,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.0.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.1.0" />
     <PackageReference Include="NSubstitute" Version="4.1.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />