Remove stale imports

Signed-off-by: Alexandros Koumparoulis <akoumparouli@nvidia.com>

nemo/collections/llm/recipes/mistral_nemo_12b.py

@@ -24,9 +24,7 @@
 from nemo import lightning as nl
 from nemo.collections.llm.api import finetune, pretrain
 from nemo.collections.llm.gpt.data.mock import MockDataModule
-from nemo.collections.llm.gpt.data.squad import SquadDataModule
 from nemo.collections.llm.gpt.model.mistral import MistralModel, MistralNeMo2407Config12B
-from nemo.collections.llm.peft.lora import LoRA
 from nemo.collections.llm.recipes.log.default import default_log, default_resume, tensorboard_logger
 from nemo.collections.llm.recipes.optim.adam import distributed_fused_adam_with_cosine_annealing
 from nemo.collections.llm.recipes.precision.mixed_precision import bf16_mixed