Revert Microsoft.Testing.Extensions.CodeCoverage NuGet Package to v18.0.4

Author: TheCodeTraveler

src/CommunityToolkit.Maui.Markup.UnitTests/CommunityToolkit.Maui.Markup.UnitTests.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="NUnit" Version="4.4.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="5.2.0" PrivateAssets="all" />
     <PackageReference Include="NUnit.Analyzers" Version="4.11.2" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.1.0" />
+    <PackageReference Include="Microsoft.Testing.Extensions.CodeCoverage" Version="18.0.4" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="CommunityToolkit.Maui" Version="$(MauiCommunityToolkitPackageVersion)" />
     <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiPackageVersion)"/>