Bump xunit.runner.visualstudio from 2.4.3 to 2.5.6

Bumps [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) from 2.4.3 to 2.5.6.
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@v2.4.3...2.5.6)

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

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

Author: dependabot[bot]

OpenAPI/LearningHub.Nhs.OpenApi.Tests/LearningHub.Nhs.OpenApi.Tests.csproj

@@ -14,7 +14,7 @@
         <PackageReference Include="Moq" Version="4.20.70" />
         <PackageReference Include="NBuilder" Version="6.1.0" />
         <PackageReference Include="xunit" Version="2.6.6" />
-        <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>