pybind/mgr: disable mypy error in diskprediction_local module

Currently on python 3.12 mypy detects one of the variables used in the
expression as an zero-element tuple. This module is not getting a lot
of attention so I'm doing the bare minimum to stop the tests from
failing here and silencing mypy with a magic comment.

Signed-off-by: John Mulligan <[email protected]>

Author: phlogistonjohn

src/pybind/mgr/diskprediction_local/predictor.py

@@ -168,7 +168,7 @@ def __preprocess(self, disk_days: Sequence[DevSmartT], manufacturer: str) -> Opt
         roll_window_size = 6
 
         # rolling means generator
-        dataset_size = disk_days_attrs.shape[0] - roll_window_size + 1
+        dataset_size = disk_days_attrs.shape[0] - roll_window_size + 1  # type: ignore
         gen = (disk_days_attrs[i: i + roll_window_size, ...].mean(axis=0)
                for i in range(dataset_size))
         means = np.vstack(gen)  # type: ignore