Simplify StringContent assignment in HTTP request

Refactored code to assign StringContent directly to httpReq.Content without a using block. Disposal of StringContent is now handled by HttpRequestMessage, improving code clarity and resource management.

src/ReC.Application/RecActions/Commands/InvokeRecActionViewCommand.cs

@@ -43,10 +43,7 @@ public class InvokeRecActionViewCommandHandler(
             .ToHttpRequestMessage(action.EndpointUri);
 
         if (action.Body is not null)
-        {
-            using var reqBody = new StringContent(action.Body);
-            httpReq.Content = reqBody;
-        }
+            httpReq.Content = new StringContent(action.Body);
 
         if (action.Headers is not null)
             foreach (var header in action.Headers)