Bump AkkaVersion from 1.4.29 to 1.4.31 (#279)

Bumps `AkkaVersion` from 1.4.29 to 1.4.31.

Updates `Akka` from 1.4.29 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@1.4.29...1.4.31)

Updates `Akka.Serialization.Hyperion` from 1.4.29 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@1.4.29...1.4.31)

Updates `Akka.TestKit.Xunit2` from 1.4.29 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@1.4.29...1.4.31)

---
updated-dependencies:
- dependency-name: Akka
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Akka.Serialization.Hyperion
  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] <support@github.com>

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

src/common.props

@@ -21,7 +21,7 @@ Please report any serialization problem that occurs after an upgrade to this ver
     <NetTestVersion>net5.0</NetTestVersion>
     <NetFrameworkTestVersion>net471</NetFrameworkTestVersion>
     <NetStandardLibVersion>netstandard2.0</NetStandardLibVersion>
-    <AkkaVersion>1.4.29</AkkaVersion>
+    <AkkaVersion>1.4.31</AkkaVersion>
     <FluentAssertionsVersion>6.2.0</FluentAssertionsVersion>
     <XunitVersion>2.4.1</XunitVersion>
     <XunitRunnerVersion>2.4.3</XunitRunnerVersion>