Bump Microsoft.NET.Test.Sdk from 18.5.0 to 18.5.1

---
updated-dependencies:
- dependency-name: Microsoft.NET.Test.Sdk
  dependency-version: 18.5.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -5,7 +5,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="28.2.0" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.5.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageVersion Include="Polyfill" Version="10.3.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.173" />
     <PackageVersion Include="Verify" Version="31.16.2" />