Bump Akka.Cluster.TestKit from 1.4.27 to 1.4.31 (#115)

Bumps [Akka.Cluster.TestKit](https://github.com/akkadotnet/akka.net) from 1.4.27 to 1.4.31.
- [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@1.4.27...1.4.31)

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

src/common.props

@@ -24,7 +24,7 @@
     <NetStandardLibVersion>netstandard2.0</NetStandardLibVersion>
     <FluentAssertionsVersion>6.2.0</FluentAssertionsVersion>
     <FsCheckVersion>2.9.0</FsCheckVersion>
-    <AkkaVersion>1.4.27</AkkaVersion>
+    <AkkaVersion>1.4.31</AkkaVersion>
     <!--
     <AkkaVersion>1.4.28-beta637717616449070703</AkkaVersion>
     -->