Bump Microsoft.NET.Test.Sdk in /PreMailer.Net/PreMailer.Net.Tests

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 15.0.0 to 16.2.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v15.0.0...v16.2.0)

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

Author: dependabot-preview[bot]

PreMailer.Net/PreMailer.Net.Tests/PreMailer.Net.Tests.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
     <PackageReference Include="Moq" Version="4.7.63" />
     <PackageReference Include="MSTest.TestFramework" Version="1.3.2" />
     <PackageReference Include="MSTest.TestAdapter" Version="1.3.2" />