Bump Microsoft.NET.Test.Sdk from 18.0.1 to 18.4.0

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tests/SharpProp.Tests/SharpProp.Tests.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="AwesomeAssertions" Version="9.4.0" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
     <PackageReference Include="xunit.v3" Version="3.2.2" />
     <PackageReference Include="Xunit.Combinatorial" Version="2.0.24" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">