Fix lint issues after merge

- Remove unused AlgoConfig import from main_ppo.py
- Remove unused BaseCheckpointManager and omega_conf_to_dataclass imports from ray_trainer.py
- All pre-commit checks now pass

Co-Authored-By: H <linhaibin.eric@gmail.com>

verl/trainer/main_ppo.py

@@ -22,7 +22,6 @@
 import ray
 from omegaconf import OmegaConf
 
-from verl.trainer.config.algorithm import AlgoConfig
 from verl.trainer.ppo.ray_trainer import RayPPOTrainer
 from verl.trainer.ppo.reward import load_reward_manager
 from verl.utils.config import omega_conf_to_dataclass

verl/trainer/ppo/ray_trainer.py

@@ -51,8 +51,7 @@
     process_validation_metrics,
 )
 from verl.trainer.ppo.reward import compute_reward, compute_reward_async
-from verl.utils.checkpoint.checkpoint_manager import BaseCheckpointManager, find_latest_ckpt_path, should_save_ckpt_esi
-from verl.utils.config import omega_conf_to_dataclass
+from verl.utils.checkpoint.checkpoint_manager import find_latest_ckpt_path, should_save_ckpt_esi
 from verl.utils.debug import marked_timer
 from verl.utils.metric import (
     reduce_metrics,