Update dependency Microsoft.NET.Test.Sdk to 18.4.0

Author: renovate[bot]

TruePath.Tests/TruePath.Tests.csproj

@@ -16,7 +16,7 @@ SPDX-License-Identifier: MIT
     <ItemGroup>
         <PackageReference Include="FsCheck.Xunit.v3" Version="3.3.2" />
         <PackageReference Include="JetBrains.Annotations" Version="2025.2.4" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>