build(deps): bump xunit.runner.visualstudio from 2.5.5 to 2.5.6

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]>

Octokit.Tests.Conventions/Octokit.Tests.Conventions.csproj

@@ -35,7 +35,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="xunit" Version="2.6.4" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">

Octokit.Tests.Integration/Octokit.Tests.Integration.csproj

@@ -37,7 +37,7 @@
 	<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
 	<PackageReference Include="System.IO.Compression" Version="4.3.0" />
   <PackageReference Include="xunit" Version="2.6.4" />
-  <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5" />
+  <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 
   <ItemGroup>

Octokit.Tests/Octokit.Tests.csproj

@@ -36,7 +36,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="xunit" Version="2.6.4" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net462' ">