CUDA: if no nvidia-smi program, don't complain so loudly.

Author: mr-c

cwltool/cuda.py

@@ -13,7 +13,7 @@ def cuda_version_and_device_count() -> tuple[str, int]:
     try:
         out: Union[str, bytes] = subprocess.check_output(["nvidia-smi", "-q", "-x"])  # nosec
     except Exception as e:
-        _logger.warning("Error checking CUDA version with nvidia-smi: %s", e, exc_info=e)
+        _logger.debug("Error checking CUDA version with nvidia-smi: %s", e, exc_info=e)
         return ("", 0)
     dm = xml.dom.minidom.parseString(out)  # nosec