Bump AkkaVersion from 1.5.12 to 1.5.13 (#63)

Bumps `AkkaVersion` from 1.5.12 to 1.5.13.

Updates `Akka` from 1.5.12 to 1.5.13
- [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@1.5.12...1.5.13)

Updates `Akka.TestKit.Xunit2` from 1.5.12 to 1.5.13
- [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@1.5.12...1.5.13)

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

@@ -20,7 +20,7 @@
     <XunitRunnerVisualstudio>2.5.0</XunitRunnerVisualstudio>
     <TestSdkVersion>17.7.2</TestSdkVersion>
 
-    <AkkaVersion>1.5.12</AkkaVersion>
+    <AkkaVersion>1.5.13</AkkaVersion>
     <AkkaHostingVersion>1.5.12.1</AkkaHostingVersion>
     <FluentAssertionsVersion>6.12.0</FluentAssertionsVersion>
     <BenchmarkDotNetVersion>0.13.8</BenchmarkDotNetVersion>