fix: accept 204 No Content status code in ping method

- Update the ping method to consider 204 No Content as a valid response
- This change improves compatibility with services that may return 204 instead of 200

Author: Mahoo12138

lib/src/client.dart

@@ -48,11 +48,12 @@ class Client {
       this.c.options.receiveTimeout = Duration(milliseconds: timeout);
 
   /// Test whether the service can connect
+  /// Accepts both 200 OK and 204 No Content status codes as valid responses
   Future<void> ping([CancelToken? cancelToken]) async {
     var resp = await c.wdOptions(this, '/', cancelToken: cancelToken);
-    if (resp.statusCode != 200) {
-      throw newResponseError(resp);
-    }
+  if (resp.statusCode != 200 && resp.statusCode != 204) {
+    throw newResponseError(resp);
+  }
   }
 
   // Future<void> getQuota([CancelToken cancelToken]) async {