Update DeepSpeedOptimizer import for deepspeed >= 0.14.1

[linbo0518]

What does this PR do?

Fix DeepSpeedOptimizer import error

DeepSpeed team remove DeepSpeedOptimizer from the __init__.py

microsoft/DeepSpeed@c56a4b9

[rank1]: Traceback (most recent call last):
[rank1]:   File "/data/projects/livdet2025/train.py", line 140, in <module>
[rank1]:     main()
[rank1]:   File "/data/projects/livdet2025/train.py", line 134, in main
[rank1]:     train_helper.load_state(checkpoint, model, optimizer, lr_scheduler)
[rank1]:   File "/data/projects/livdet2025/utils.py", line 253, in load_state
[rank1]:     }
[rank1]:   File "/data/.pyenv/versions/livdet/lib/python3.10/site-packages/lightning/fabric/fabric.py", line 775, in load
[rank1]:     remainder = self._strategy.load_checkpoint(path=path, state=unwrapped_state, strict=strict)
[rank1]:   File "/data/.pyenv/versions/livdet/lib/python3.10/site-packages/lightning/fabric/strategies/deepspeed.py", line 501, in load_checkpoint
[rank1]:     from deepspeed.runtime import DeepSpeedOptimizer
[rank1]: ImportError: cannot import name 'DeepSpeedOptimizer' from 'deepspeed.runtime' (/data/.pyenv/versions/livdet/lib/python3.10/site-packages/deepspeed/runtime/__init__.py)

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📚 Documentation preview 📚: https://pytorch-lightning--20040.org.readthedocs.build/en/20040/

[awaelchli]

Looks good @linbo0518, thanks! We still have to make it compatible with other versions, see my suggestion below.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90%. Comparing base (693c21a) to head (6071957).
Report is 73 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20040      +/-   ##
==========================================
+ Coverage      83%      90%      +7%     
==========================================
  Files         427      266     -161     
  Lines       35460    22942   -12518     
==========================================
- Hits        29596    20722    -8874     
+ Misses       5864     2220    -3644     

[awaelchli]

Thank you for doing this @linbo0518 🚀