fix : dio call

packages/auth/lib/data/repositories/auth_repository_imp.dart

@@ -34,13 +34,15 @@ class AuthRepositoryImpl implements AuthRepository {
 
   @override
   Future<CaptchaResponseModel?> captcha() async {
-    final response = await safeCall(
-      call:
-          () async => await _httpClient.post<CaptchaResponseModel>(
-            'captcha/',
-            headers: {'Content-Type': 'application/json'},
-            fromJson: CaptchaResponseModel.fromJson
-          ),
+    final response = await safeCall<CaptchaResponseModel?>(
+      call: () async {
+        var res = await _httpClient.post<CaptchaResponseModel?>(
+          'captcha/',
+          fromJson: CaptchaResponseModel.fromJson,
+        );
+
+        return res.data;
+      },
       onSuccess: (response) {
         iLog(response);
       },
@@ -48,8 +50,7 @@ class AuthRepositoryImpl implements AuthRepository {
         throw Exception('Error during captcha : $error');
       },
     );
-
-    return response?.data;
+    return response;
   }
 
   @override