Bump Microsoft.NET.Test.Sdk from 17.14.1 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-major
...

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

Author: dependabot[bot]

src/Machine.Specifications.Runner.ReSharper.Tests/Machine.Specifications.Runner.ReSharper.Tests.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="JetBrains.ReSharper.TestRunner.Abstractions" Version="2.16.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="NUnit" Version="4.4.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.10.0">