Merge pull request #452 from milkshakesoftware/dependabot/nuget/PreMailer.Net/PreMailer.Net.Tests/Microsoft.NET.Test.Sdk-18.5.1

Author: github-actions[bot]

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

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="AngleSharp" Version="1.4.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />