Use qpu_sampling_time

`run_time_chip` is deprecated
https://int.se.dwavesystems.com/qubist/docs/sys_intro_release_notes/release_notes_c_2_4/#enhancements-to-system-timers

Author: bellert

factoring/interfaces.py

@@ -134,6 +134,6 @@ def factor(P, use_saved_embedding=True):
     output['numberOfReads'] = total
 
     if 'timing' in response.info:
-        output['timing']['actual']['qpuProcessTime'] = response.info['timing']['run_time_chip']
+        output['timing']['actual']['qpuProcessTime'] = response.info['timing']['qpu_sampling_time']
 
     return output