Set upper bound on transformers dependency to <4.30

[oliverholworthy]

Fixes Error we're seeing in our tests with TensorFlow versions prior to 2.11

/opt/hostedtoolcache/Python/3.8.16/x64/lib/python3.8/site-packages/transformers/modeling_tf_utils.py:84: in <module>
    from tensorflow.python.keras.engine import call_context
E   ImportError: cannot import name 'call_context' from 'tensorflow.python.keras.engine' (/opt/hostedtoolcache/Python/3.8.16/x64/lib/python3.8/site-packages/tensorflow/python/keras/engine/__init__.py)

The newest version of the transformers package 4.30.0 started importing a module that only exists in TensorFlow 2.11 and above.

Setting this upper bound for now until we drop support for TensorFlow 2.10 and earlier, or this is updated in transformers to restore support for earlier versions of TensorFlow (related issue here)

[github-actions]

Documentation preview

https://nvidia-merlin.github.io/models/review/pr-1140

[oliverholworthy]

4.30.1 of transformers was released with a fix that restores support for earlier versions of TensorFlow