chore: small mypy issue (#2803)

Signed-off-by: Naren Dasan <[email protected]>
Signed-off-by: Naren Dasan <[email protected]>

Author: narendasan

py/torch_tensorrt/dynamo/_settings.py

@@ -1,5 +1,5 @@
 from dataclasses import dataclass, field
-from typing import Collection, Optional, Union
+from typing import Collection, Optional, Set, Union
 
 from torch.fx.node import Target
 from torch_tensorrt._Device import Device
@@ -71,7 +71,7 @@ class CompilationSettings:
         hardware_compatible (bool): Build the TensorRT engines compatible with GPU architectures other than that of the GPU on which the engine was built (currently works for NVIDIA Ampere and newer)
     """
 
-    enabled_precisions: dtype = field(default_factory=lambda: ENABLED_PRECISIONS)
+    enabled_precisions: Set[dtype] = field(default_factory=lambda: ENABLED_PRECISIONS)
     debug: bool = DEBUG
     workspace_size: int = WORKSPACE_SIZE
     min_block_size: int = MIN_BLOCK_SIZE