chore(deps): update dependency serilog.sinks.async to v2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Serilog.Sinks.Async (source)	1.5.0 -> 2.0.0

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Release Notes

serilog/serilog-sinks-async (Serilog.Sinks.Async)

### [`v2.0.0`](https://togithub.com/serilog/serilog-sinks-async/releases/tag/v2.0.0) - [#​85](https://togithub.com/serilog/serilog-sinks-async/issues/85) - fixed typo in README.md ([@​NielsPilgaard](https://togithub.com/NielsPilgaard)) - [#​95](https://togithub.com/serilog/serilog-sinks-async/issues/95) - update to Serilog 4, remove redundant `WriteTo.Async()` overloads, drop pre-`netstandard2.0` TFMs ([@​nblumhardt](https://togithub.com/nblumhardt))

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.3%. Comparing base (5e496e3) to head (5d66968).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1165 +/- ## ===================================== Coverage 76.3% 76.3% ===================================== Files 256 256 Lines 11333 11333 Branches 1138 1138 ===================================== Hits 8653 8653 Misses 2348 2348 Partials 332 332 ```

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