Fix typo in quantization_operations in PEFT integrations

[redpanda1995]

What does this PR do?

Fixes [# (issue)]

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[Rocketknight1]

cc @sayakpaul - will this fix break the call?

[sayakpaul]

I think @ArthurZucker is more equipped to answer that.

[ArthurZucker]

Ty cc @Cyrilvallez from your #43585 👁️ 👁️

[ishaan-shivhare]

Hi sorry, following up on this since I had raised the original issue
Isn't it still incorrect:

transformers/src/transformers/core_model_loading.py

Line 517 in 609e3d5

quantization_operation: ConversionOps | None = None

shouldn't it be quantization_operation singular?

[Cyrilvallez]

Damn, thanks a lot @ishaan-shivhare! You're really correct 😅 Just opened #44053 to fix it!