Bump xunit.runner.visualstudio from 2.5.3 to 2.5.4 (#250)

Bumps [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) from 2.5.3 to 2.5.4.
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.3...2.5.4)

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

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

Author: dependabot[bot]

src/Directory.Build.targets

@@ -12,7 +12,7 @@
 
 	<ItemGroup Condition="'$(IncludeTesting)' == 'true'">
 		<PackageReference Include="xunit" Version="2.6.2" />
-		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" />
+		<PackageReference Include="xunit.runner.visualstudio" Version="2.5.4" />
 		<PackageReference Include="xunit.runner.msbuild" Version="2.6.2" />
 		<PackageReference Include="Moq" Version="4.18.4" />
 		<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />