deps: Bump Microsoft.NET.Test.Sdk from 17.12.0 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-major
...

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

Author: dependabot[bot]

samples/dotnet/login-auth-code/tests/login-auth-code.tests.csproj

@@ -8,7 +8,7 @@
     <RootNamespace>LoginAuthCode.Tests</RootNamespace>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.0.1" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.0" />