Update Serilog dependency

Author: nblumhardt

src/Serilog.Sinks.Async/Serilog.Sinks.Async.csproj

@@ -29,7 +29,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Serilog" Version="4.1.0-*" />
+    <PackageReference Include="Serilog" Version="4.1.0" />
     <PackageReference Include="Nullable" Version="1.3.1" PrivateAssets="all" />
   </ItemGroup>