Update `predict` and `track` method return type (#12101)

Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

ultralytics/engine/model.py

@@ -8,6 +8,7 @@ import numpy as np
 import torch
 
 from ultralytics.cfg import TASK2DATA, get_cfg, get_save_dir
+from ultralytics.engine.results import Results
 from ultralytics.hub.utils import HUB_WEB_ROOT
 from ultralytics.nn.tasks import attempt_load_one_weight, guess_model_task, nn, yaml_model_load
 from ultralytics.utils import (
@@ -399,7 +400,7 @@ class Model(nn.Module):
         stream: bool = False,
         predictor=None,
         **kwargs,
-    ) -> list:
+    ) -> list[Results]:
         """
         Performs predictions on the given image source using the YOLO model.
 
@@ -457,7 +458,7 @@ class Model(nn.Module):
         stream: bool = False,
         persist: bool = False,
         **kwargs,
-    ) -> list:
+    ) -> list[Results]:
         """
         Conducts object tracking on the specified input source using the registered trackers.