Merge pull request #13 from stho32/dependabot/nuget/Source/spamfilter/spamfilter.BL.Tests/Microsoft.NET.Test.Sdk-18.4.0

Bump Microsoft.NET.Test.Sdk from 17.1.0-preview to 18.4.0

Author: stho32

Source/spamfilter/spamfilter.BL.Tests/spamfilter.BL.Tests.csproj

@@ -10,7 +10,7 @@
 
     <ItemGroup>
       <PackageReference Include="altcover" Version="9.0.102" />
-      <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0-preview-20211130-02" />
+      <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
       <PackageReference Include="xunit" Version="2.9.3" />
       <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>