fix: Add missing retrying package that failed the import

[terrytangyuan]

This fixes the following error:

>>> from kubeflow import training
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/homebrew/lib/python3.9/site-packages/kubeflow/training/__init__.py", line 49, in <module>
    from kubeflow.training.api.tf_job_client import TFJobClient
  File "/opt/homebrew/lib/python3.9/site-packages/kubeflow/training/api/tf_job_client.py", line 26, in <module>
    from .tf_job_watch import watch as tfjob_watch
  File "/opt/homebrew/lib/python3.9/site-packages/kubeflow/training/api/tf_job_watch.py", line 15, in <module>
    import retrying
ModuleNotFoundError: No module named 'retrying'

Signed-off-by: Yuan Tang terrytangyuan@gmail.com

[Jeffwan]

@terrytangyuan You install the package from master branch?

[Jeffwan]

/hold
/lgtm

[terrytangyuan]

@terrytangyuan You install the package from master branch?

Yes

[gaocegege]

/lgtm

Thanks for your contribution! 🎉 👍

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaocegege, Jeffwan, terrytangyuan

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[terrytangyuan]

/unhold