Update year 2020 to 2023 in one file (#21190)

* update year
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

src/transformers/file_utils.py

@@ -2,7 +2,7 @@
 # There's no way to ignore "F401 '...' imported but unused" warnings in this
 # module, but to preserve other warnings. So, don't check this module at all.
 
-# Copyright 2020 The HuggingFace Team. All rights reserved.
+# Copyright 2023 The HuggingFace Team. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.