build(deps): bump Serilog.Sinks.Async and System.Threading.Channels

Bumps [Serilog.Sinks.Async](https://github.com/serilog/serilog-sinks-async) and [System.Threading.Channels](https://github.com/dotnet/runtime). These dependencies needed to be updated together.

Updates `Serilog.Sinks.Async` from 1.5.0 to 2.0.0
- [Release notes](https://github.com/serilog/serilog-sinks-async/releases)
- [Commits](serilog/serilog-sinks-async@v1.5.0...v2.0.0)

Updates `System.Threading.Channels` from 6.0.0 to 8.0.0
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v6.0.0...v8.0.0)

---
updated-dependencies:
- dependency-name: Serilog.Sinks.Async
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: System.Threading.Channels
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Directory.Packages.props

@@ -38,7 +38,7 @@
         <PackageVersion Include="PowerArgs" Version="3.6.0" />
         <PackageVersion Include="Scrutor" Version="4.2.0" />
         <PackageVersion Include="Serilog.Extensions.Hosting" Version="7.0.0" />
-        <PackageVersion Include="Serilog.Sinks.Async" Version="1.5.0" />
+        <PackageVersion Include="Serilog.Sinks.Async" Version="2.0.0" />
         <PackageVersion Include="Serilog.Sinks.Console" Version="4.1.0" />
         <PackageVersion Include="Serilog.Sinks.File" Version="5.0.0" />
         <PackageVersion Include="Serilog.Sinks.Map" Version="1.0.2" />