Bump Akka.Hosting and Akka.Streams in /src/AkkaStreamsTemplate (#350)

Bumps [Akka.Hosting](https://github.com/akkadotnet/Akka.Hosting) and [Akka.Streams](https://github.com/akkadotnet/akka.net). These dependencies needed to be updated together.

Updates `Akka.Hosting` from 1.5.30.1 to 1.5.31
- [Release notes](https://github.com/akkadotnet/Akka.Hosting/releases)
- [Changelog](https://github.com/akkadotnet/Akka.Hosting/blob/dev/RELEASE_NOTES.md)
- [Commits](akkadotnet/Akka.Hosting@1.5.30.1...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)

---
updated-dependencies:
- dependency-name: Akka.Hosting
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Akka.Streams
  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>

src/AkkaStreamsTemplate/Directory.Packages.props

@@ -5,7 +5,7 @@
 
   <!-- Akka.NET Package Versions -->
   <ItemGroup>
-    <PackageVersion Include="Akka.Hosting" Version="1.5.30.1" />
-    <PackageVersion Include="Akka.Streams" Version="1.5.30" />
+    <PackageVersion Include="Akka.Hosting" Version="1.5.31" />
+    <PackageVersion Include="Akka.Streams" Version="1.5.31" />
   </ItemGroup>
 </Project>