Fixed error when getting data from CS and cache=True (#6932)

Fix 
```python
AttributeError: 'tuple' object has no attribute 'tobytes'
```

CHANGELOG.md

@@ -29,6 +29,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Incorrectly determined video frame count when the video contains an MP4 edit list
  (<https://github.com/opencv/cvat/pull/6929>)
+- Internal server error when retrieving data from CS and cache=True
+ (<https://github.com/opencv/cvat/pull/6932>)
 
 ### Security
 

cvat/apps/engine/cache.py

@@ -169,7 +169,7 @@ def _get_images(db_data, chunk_number):
 
  cloud_storage_instance.bulk_download_to_dir(files=files_to_download, upload_dir=tmp_dir)
 
- for checksum, fs_filename in zip(checksums, images):
+ for checksum, (_, fs_filename, _) in zip(checksums, images):
  if checksum and not md5_hash(fs_filename) == checksum:
  slogger.cloud_storage[db_cloud_storage.id].warning('Hash sums of files {} do not match'.format(file_name))
  else:

tests/python/rest_api/test_tasks.py

@@ -1418,6 +1418,36 @@ def test_create_task_with_file_pattern(
  status = self._test_cannot_create_task(self._USERNAME, task_spec, data_spec)
  assert "No media data found" in status.message
 
+ @pytest.mark.with_external_services
+ @pytest.mark.parametrize(
+ "cloud_storage_id, org",
+ [
+ (1, ""),
+ ],
+ )
+ def test_create_task_with_cloud_storage_and_retrieve_data(
+ self,
+ cloud_storage_id,
+ cloud_storages,
+ request,
+ org,
+ ):
+ cloud_storage = cloud_storages[cloud_storage_id]
+ task_id, _ = self._create_task_with_cloud_data(
+ request=request,
+ cloud_storage=cloud_storage,
+ use_manifest=True,
+ use_cache=True,
+ server_files=[],
+ org=org,
+ )
+
+ with make_api_client(self._USERNAME) as api_client:
+ (_, response) = api_client.tasks_api.retrieve_data(
+ task_id, type="chunk", quality="compressed", number=0
+ )
+ assert response.status == HTTPStatus.OK
+
  def test_can_specify_file_job_mapping(self):
  task_spec = {
  "name": f"test file-job mapping",