Bump Microsoft.NET.Test.Sdk from 18.4.0 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-minor
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -20,7 +20,7 @@
     <!-- Dependencies used for unit tests -->
     <PackageVersion Include="BenchmarkDotNet" Version="0.15.8" />
     <PackageVersion Include="NUnit" Version="4.6.0" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.4.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageVersion Include="NUnit3TestAdapter" Version="6.2.0" />
 
     <!-- To resolve dependency conflict with GirCore.GObject-2.0.Integration and BenchmarkDotNet -->