Bump Akka.TestKit.XUnit2 from 1.5.1 to 1.5.2 (#331)

Bumps [Akka.TestKit.XUnit2](https://github.com/akkadotnet/akka.net) from 1.5.1 to 1.5.2.
- [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@1.5.1...1.5.2)

---
updated-dependencies:
- dependency-name: Akka.TestKit.XUnit2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Aaron Stannard <aaron@petabridge.com>
Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

src/Directory.Build.props

@@ -22,7 +22,7 @@
     <NetStandardVersion>netstandard1.6</NetStandardVersion>
     <NetFrameworkLibVersion>net461</NetFrameworkLibVersion>
     <NetFrameworkTestVersion>net6.0</NetFrameworkTestVersion>
-    <AkkaVersion>1.5.1</AkkaVersion>
+    <AkkaVersion>1.5.2</AkkaVersion>
     <PbmVersion>1.3.0</PbmVersion>
   </PropertyGroup>
   <ItemGroup>