Bump MSTest.TestFramework from 3.6.4 to 3.7.1

Bumps [MSTest.TestFramework](https://github.com/microsoft/testfx) from 3.6.4 to 3.7.1.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.6.4...v3.7.1)

---
updated-dependencies:
- dependency-name: MSTest.TestFramework
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Tests/Tests.csproj

@@ -73,6 +73,6 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.6.4" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.6.4" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.7.1" />
   </ItemGroup>
 </Project>