Update dependency Microsoft.NET.Test.Sdk to 17.12.0 (#190)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

src/Cake.Markdownlint.Tests/Cake.Markdownlint.Tests.csproj

@@ -15,7 +15,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Cake.Core" Version="4.0.0" />
     <PackageReference Include="Cake.Testing" Version="4.0.0" />
     <PackageReference Include="Shouldly" Version="4.2.1" />