Merge pull request #3227 from JoeZiminski/remove_unused_rng_from_drifting_generation

Remove unused rng from `drifting_generator.py`

Author: alejoe91

src/spikeinterface/generation/drifting_generator.py

@@ -348,9 +348,6 @@ def generate_drifting_recording(
 
         This can be helpfull for motion benchmark.
     """
-
-    rng = np.random.default_rng(seed=seed)
-
     # probe
     if generate_probe_kwargs is None:
         generate_probe_kwargs = _toy_probes[probe_name]