Bump Akka.Logger.Serilog from 1.5.7 to 1.5.12 (#370)

Bumps [Akka.Logger.Serilog](https://github.com/akkadotnet/Akka.Logger.Serilog) from 1.5.7 to 1.5.12.
- [Release notes](https://github.com/akkadotnet/Akka.Logger.Serilog/releases)
- [Changelog](https://github.com/akkadotnet/Akka.Logger.Serilog/blob/dev/RELEASE_NOTES.md)
- [Commits](akkadotnet/Akka.Logger.Serilog@1.5.7...1.5.12)

---
updated-dependencies:
- dependency-name: Akka.Logger.Serilog
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Examples/Akka.Hosting.LoggingDemo/Akka.Hosting.LoggingDemo.csproj

@@ -11,7 +11,7 @@
     </ItemGroup>
 
     <ItemGroup>
-      <PackageReference Include="Akka.Logger.Serilog" Version="1.5.7" />
+      <PackageReference Include="Akka.Logger.Serilog" Version="1.5.12" />
       <PackageReference Include="Serilog.Sinks.Console" Version="4.1.0" />
     </ItemGroup>
 </Project>