Support both *.yml and *.yaml files (#4086)

Co-authored-by: ChristopherRogers1991 <ChristopherRogers1991@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Sungjoo(Dennis) Hwang <48212469+Denny-Hwang@users.noreply.github.com>

ultralytics/models/fastsam/model.py

@@ -23,7 +23,7 @@ class FastSAM(Model):
         """Call the __init__ method of the parent class (YOLO) with the updated default model"""
         if model == 'FastSAM.pt':
             model = 'FastSAM-x.pt'
-        assert Path(model).suffix != '.yaml', 'FastSAM models only support pre-trained models.'
+        assert Path(model).suffix not in ('.yaml', '.yml'), 'FastSAM models only support pre-trained models.'
         super().__init__(model=model, task='segment')
 
     @property