Bump Akka.TestKit.Xunit2 from 1.5.38 to 1.5.39 in /unit-1/completed

Bumps [Akka.TestKit.Xunit2](https://github.com/akkadotnet/akka.net) from 1.5.38 to 1.5.39.
- [Release notes](https://github.com/akkadotnet/akka.net/releases)
- [Changelog](https://github.com/akkadotnet/akka.net/blob/dev/RELEASE_NOTES.md)
- [Commits](akkadotnet/akka.net@1.5.38...1.5.39)

---
updated-dependencies:
- dependency-name: Akka.TestKit.Xunit2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

unit-1/completed/AkkaWordCounter2.App.Tests/AkkaWordCounter2.App.Tests.csproj

@@ -10,7 +10,7 @@
 
     <ItemGroup>
         <PackageReference Include="Akka.Hosting.TestKit" Version="1.5.38" />
-        <PackageReference Include="Akka.TestKit.Xunit2" Version="1.5.38" />
+        <PackageReference Include="Akka.TestKit.Xunit2" Version="1.5.39" />
         <PackageReference Include="coverlet.collector" Version="6.0.4">
           <PrivateAssets>all</PrivateAssets>
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>