Bump Akka.TestKit.XUnit2 from 1.4.49 to 1.5.1 (#327)

Bumps [Akka.TestKit.XUnit2](https://github.com/akkadotnet/akka.net) from 1.4.49 to 1.5.1.
- [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@1.4.49...1.5.1)

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

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

src/common.props

@@ -25,7 +25,7 @@ Migrated onto .NET 6.</PackageReleaseNotes>
     <NetStandardVersion>netstandard1.6</NetStandardVersion>
     <NetFrameworkLibVersion>net461</NetFrameworkLibVersion>
     <NetFrameworkTestVersion>net6.0</NetFrameworkTestVersion>
-    <AkkaVersion>1.4.49</AkkaVersion>
+    <AkkaVersion>1.5.1</AkkaVersion>
     <PbmVersion>1.2.1</PbmVersion>
   </PropertyGroup>
 </Project>