Update Serilog dependency version

Author: bdovaz

src/Serilog.Formatting.Compact/Serilog.Formatting.Compact.csproj

@@ -19,7 +19,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Serilog" Version="2.8.0" />
+    <PackageReference Include="Serilog" Version="2.9.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'net452' ">