Bump xunit.runner.visualstudio in /TeachingRecordSystem

Bumps [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) from 2.5.5 to 2.5.6.
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.5...2.5.6)

---
updated-dependencies:
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

TeachingRecordSystem/Directory.Packages.props

@@ -83,6 +83,6 @@
     <PackageVersion Include="xunit" Version="2.6.2" />
     <PackageVersion Include="xunit.assert" Version="2.6.3" />
     <PackageVersion Include="Xunit.DependencyInjection" Version="8.9.0" />
-    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.5" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 </Project>