Use Python 3.9 syntax in tests (#37343)

Signed-off-by: cyy <cyyever@outlook.com>

tests/models/speech_encoder_decoder/test_modeling_flax_speech_encoder_decoder.py

@@ -1,4 +1,3 @@
-# coding=utf-8
 # Copyright 2022 HuggingFace Inc. team.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -433,7 +432,7 @@ class FlaxEncoderDecoderMixin:
         self.check_encoder_decoder_model_generate(**input_ids_dict)
 
     def assert_almost_equals(self, a: np.ndarray, b: np.ndarray, tol: float):
-        diff = np.abs((a - b)).max()
+        diff = np.abs(a - b).max()
         self.assertLessEqual(diff, tol, f"Difference between torch and flax is {diff} (>= {tol}).")
 
     @slow

tests/models/speech_encoder_decoder/test_modeling_speech_encoder_decoder.py

@@ -1,4 +1,3 @@
-# coding=utf-8
 # Copyright 2021 HuggingFace Inc. team.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");