DEPR: camelCase in offsets, get_offset (#30340)

Author: jbrockmendel

asv_bench/benchmarks/tslibs/offsets.py

@@ -59,7 +59,7 @@ def setup(self, offset):
 
     def time_on_offset(self, offset):
         for date in self.dates:
-            offset.onOffset(date)
+            offset.is_on_offset(date)
 
 
 class OffestDatetimeArithmetic: