fix error type

Author: AntoineSimoulin

torchvision/transforms/v2/functional/_type_conversion.py

@@ -25,7 +25,7 @@ def _import_cvcuda_modules():
 
         return cvcuda
     except ImportError as e:
-        raise RuntimeError(
+        raise ImportError(
             "CV-CUDA is required but not installed. "
             "Please install it following the instructions at "
             "https://github.com/CVCUDA/CV-CUDA or via pip: "