Merge pull request #1340 from zm711/blackrock_dep

Switch `np.math.ceil` to `math.ceil` as the former is deprecated as of NumPy 1.25

Author: apdavison

neo/rawio/blackrockrawio.py

@@ -61,6 +61,7 @@
 import os
 import re
 import warnings
+import math
 
 import numpy as np
 import quantities as pq
@@ -646,7 +647,7 @@ def _get_timestamp_slice(self, timestamp, seg_index, t_start, t_stop):
         if t_start is None:
             ind_start = None
         else:
-            ts = np.math.ceil(t_start * self.__nev_basic_header['timestamp_resolution'])
+            ts = math.ceil(t_start * self.__nev_basic_header['timestamp_resolution'])
             ind_start = np.searchsorted(timestamp, ts)
 
         if t_stop is None: