chore: bump the dependencies group

Bumps the dependencies group in /test/SerialBox.Tests with 2 updates: [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) and [xunit](https://github.com/xunit/xunit).


Updates `xunit.runner.visualstudio` 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)

Updates `xunit` from 2.6.1 to 2.6.2
- [Commits](xunit/xunit@2.6.1...2.6.2)

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

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

test/SerialBox.Tests/SerialBox.Tests.csproj

@@ -24,11 +24,11 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="xunit" Version="2.6.1" />
+    <PackageReference Include="xunit" Version="2.6.2" />
   </ItemGroup>
 
   <ItemGroup>