fix NameError: name 'ApexGuardDefaults' is not defined

[raybellwaves]

What does this PR do ?

I believe this should fix #9320

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[sitloboi2012]

LGTM

[sitloboi2012]

Please someone help me merge this PR pls, its only one line and blocking me from doing the work :)

[github-actions]

This PR is stale because it has been open for 14 days with no activity. Remove stale label or comment or update or this will be closed in 7 days.

[janekl]

Thank you for reporting the issue. The suggested change is already in main

NeMo/nemo/collections/nlp/models/language_modeling/megatron/gpt_layer_modelopt_spec.py

Line 15 in 3e2bb21

from nemo.collections.nlp.modules.common.megatron.utils import ApexGuardDefaults

so I'll close the MR