Update repo to isort v5 (#6686)

* Run new isort

* More changes

* Update CI, CONTRIBUTING and benchmarks

tests/test_modeling_common.py

@@ -29,19 +29,19 @@ if is_torch_available():
     import torch
 
     from transformers import (
-        AdaptiveEmbedding,
-        PretrainedConfig,
-        PreTrainedModel,
-        BertConfig,
-        BertModel,
         BERT_PRETRAINED_MODEL_ARCHIVE_LIST,
-        MODEL_FOR_MULTIPLE_CHOICE_MAPPING,
-        MODEL_FOR_QUESTION_ANSWERING_MAPPING,
         MODEL_FOR_CAUSAL_LM_MAPPING,
         MODEL_FOR_MASKED_LM_MAPPING,
+        MODEL_FOR_MULTIPLE_CHOICE_MAPPING,
+        MODEL_FOR_QUESTION_ANSWERING_MAPPING,
         MODEL_FOR_SEQ_TO_SEQ_CAUSAL_LM_MAPPING,
         MODEL_FOR_SEQUENCE_CLASSIFICATION_MAPPING,
         MODEL_FOR_TOKEN_CLASSIFICATION_MAPPING,
+        AdaptiveEmbedding,
+        BertConfig,
+        BertModel,
+        PretrainedConfig,
+        PreTrainedModel,
         top_k_top_p_filtering,
     )