Backport PR #39551: CI: numpy deprecation warnings (#39635)

Co-authored-by: jbrockmendel <[email protected]>

Author: simonjayhawkins

asv_bench/benchmarks/series_methods.py

@@ -87,8 +87,8 @@ def setup(self):
         self.vals_short = np.arange(2).astype(object)
         self.vals_long = np.arange(10 ** 5).astype(object)
         # because of nans floats are special:
-        self.s_long_floats = Series(np.arange(10 ** 5, dtype=np.float)).astype(object)
-        self.vals_long_floats = np.arange(10 ** 5, dtype=np.float).astype(object)
+        self.s_long_floats = Series(np.arange(10 ** 5, dtype=np.float_)).astype(object)
+        self.vals_long_floats = np.arange(10 ** 5, dtype=np.float_).astype(object)
 
     def time_isin_nans(self):
         # if nan-objects are different objects,