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

Author: renovate[bot]

Doppler.HelloMicroservice/Doppler.HelloMicroservice.csproj

@@ -11,7 +11,7 @@
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.22.1" />
     <PackageReference Include="Serilog.Extensions.Hosting" Version="7.0.0" />
     <PackageReference Include="Serilog.Settings.Configuration" Version="7.0.0" />
-    <PackageReference Include="Serilog.Sinks.Async" Version="1.5.0" />
+    <PackageReference Include="Serilog.Sinks.Async" Version="2.1.0" />
     <PackageReference Include="Serilog.Sinks.Console" Version="4.1.0" />
     <PackageReference Include="Serilog.Sinks.Debug" Version="2.0.0" />
     <PackageReference Include="Serilog.Sinks.File" Version="5.0.0" />