Bump AkkaVersion from 1.5.30 to 1.5.31

Bumps `AkkaVersion` from 1.5.30 to 1.5.31.

Updates `Akka` from 1.5.30 to 1.5.31
- [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@1.5.30...1.5.31)

Updates `Akka.Streams` from 1.5.30 to 1.5.31
- [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@1.5.30...1.5.31)

Updates `Akka.Streams.TestKit` from 1.5.30 to 1.5.31
- [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@1.5.30...1.5.31)

Updates `FluentAssertions` from 6.12.1 to 5.10.3
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.12.1...5.10.3)

---
updated-dependencies:
- dependency-name: Akka
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Akka.Streams
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Akka.Streams.TestKit
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: FluentAssertions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Directory.Packages.props

@@ -3,7 +3,7 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
    <PropertyGroup Label="SharedVersions">
-    <AkkaVersion>1.5.30</AkkaVersion>
+    <AkkaVersion>1.5.31</AkkaVersion>
     <AkkaHostingVersion>1.5.30.1</AkkaHostingVersion>
     <OtelVersion>1.9.0</OtelVersion>
   </PropertyGroup>