Update content type in ControllerActionsFactory

Author: rpagyc

src/Simplify.Web.Swagger/ControllerActionsFactory.cs

@@ -137,7 +137,7 @@ private static OpenApiRequestBody CreateRequestBody(Type controllerType, Documen
 
 		request.Content = new Dictionary<string, OpenApiMediaType>
 		{
-			["application/json"] = new() { Schema = context.SchemaGenerator.GenerateSchema(item.Model, context.SchemaRepository) }
+			[item.ContentType] = new() { Schema = context.SchemaGenerator.GenerateSchema(item.Model, context.SchemaRepository) }
 		};
 
 		return request;
@@ -164,4 +164,4 @@ private static OpenApiResponse CreateResponse(ProducesResponseAttribute produces
 
 		return response;
 	}
-}
+}