(dependabot): Bump MSTest.TestFramework from 3.5.0 to 3.5.1 (#21)

Bumps [MSTest.TestFramework](https://github.com/microsoft/testfx) from 3.5.0 to 3.5.1.
- [Release notes](https://github.com/microsoft/testfx/releases)
- [Changelog](https://github.com/microsoft/testfx/blob/main/docs/Changelog.md)
- [Commits](microsoft/testfx@v3.5.0...v3.5.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

TJC.Singleton.Tests/TJC.Singleton.Tests.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="coverlet.collector" Version="6.0.2" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.5.1" />
-    <PackageReference Include="MSTest.TestFramework" Version="3.5.0" />
+    <PackageReference Include="MSTest.TestFramework" Version="3.5.1" />
   </ItemGroup>
 
   <ItemGroup>