Bump Akka.TestKit from 1.5.35 to 1.5.37 (#165)

Bumps [Akka.TestKit](https://github.com/akkadotnet/akka.net) from 1.5.35 to 1.5.37.
- [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@1.5.35...1.5.37)

---
updated-dependencies:
- dependency-name: Akka.TestKit
  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]

Directory.Build.props

@@ -18,7 +18,7 @@
     <PublishRepositoryUrl>true</PublishRepositoryUrl><!-- https://github.com/dotnet/sourcelink/blob/main/docs/README.md#publishrepositoryurl -->
   </PropertyGroup>
   <PropertyGroup>
-    <AkkaTestKitVersion>1.5.35</AkkaTestKitVersion>
+    <AkkaTestKitVersion>1.5.37</AkkaTestKitVersion>
     <MicrosoftNetTestSdkVersion>17.12.0</MicrosoftNetTestSdkVersion>
     <NUnit3Version>3.14.0</NUnit3Version>
     <NUnit4Version>4.3.2</NUnit4Version>