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]>

UtilitiesTests/UtilitiesTests.csproj

@@ -27,7 +27,7 @@
     <PackageReference Include="Serilog" Version="3.1.1" />
     <PackageReference Include="xunit" Version="2.6.4" />
     <PackageReference Include="xunit.analyzers" Version="1.8.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5" PrivateAssets="All" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup>