remove absl workaround as it's no longer needed (#14909)

the absl workaround hasn't been needed since 2019-04 https://github.com/abseil/abseil-py/issues/99 so it should be safe to remove it.

src/transformers/__init__.py

@@ -24,18 +24,6 @@
 
 __version__ = "4.16.0.dev0"
 
-# Work around to update TensorFlow's absl.logging threshold which alters the
-# default Python logging output behavior when present.
-# see: https://github.com/abseil/abseil-py/issues/99
-# and: https://github.com/tensorflow/tensorflow/issues/26691#issuecomment-500369493
-try:
-    import absl.logging
-except ImportError:
-    pass
-else:
-    absl.logging.set_verbosity("info")
-    absl.logging.set_stderrthreshold("info")
-    absl.logging._warn_preinit_stderr = False
 
 from typing import TYPE_CHECKING