Bump Microsoft.NET.Test.Sdk

Bumps [Microsoft.NET.Test.Sdk](https://github.com/microsoft/vstest) from 17.3.1 to 17.4.0.
- [Release notes](https://github.com/microsoft/vstest/releases)
- [Commits](microsoft/vstest@v17.3.1...v17.4.0)

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

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

Author: dependabot[bot]

core/getting-started/unit-testing-with-fsharp-nunit/MathService.Tests/MathService.Tests.fsproj

@@ -15,7 +15,7 @@
   <ItemGroup>
     <PackageReference Include="nunit" Version="3.13.3" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.4.0" />
   </ItemGroup>
 <!--</snippetPackages>-->