Fix Gemma2 Attention Args

[suiyoubi]

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[github-actions[bot]]

beep boop 🤖: 🙏 The following files have warnings. In case you are familiar with these, please try helping us to improve the code base.

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Your code was analyzed with PyLint. The following annotations have been identified:

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Your code has been rated at 10.00/10

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Thank you for improving NeMo's documentation!

[github-actions[bot]]

[🤖]: Hi @suiyoubi 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully

So it might be time to merge this PR or get some approvals

I'm just a bot so I'll leave it you what to do next.

//cc @pablo-garay @ko3n1g