refactor: remove unused serialization import in HtmxConfig

Removed an unnecessary import from the HtmxConfig file, specifically the Configuration.Serialization namespace which was not being used. This helps to keep the codebase clean and efficient.

src/Htmxor/HtmxConfig.cs

@@ -2,7 +2,6 @@
 using System.Text.Json.Serialization;
 using System.Text.Json.Serialization.Metadata;
 using Htmxor.Antiforgery;
-using Htmxor.Configuration.Serialization;
 
 namespace Htmxor;