python: fix Python retry implementation

Addresses #5572

GitOrigin-RevId: 9b82eb94f8a77165230ec16c3d3f5aa974f7dea0

Author: etodd

strongdm/client.py

@@ -17,6 +17,7 @@
 
 import grpc
 import hmac
+import random
 import hashlib
 import base64
 import datetime
@@ -93,7 +94,7 @@ def jitterSleep(self, iter):
         if (dur_max > self.max_retry_delay):
             dur_max = self.max_retry_delay
         # get a value between 0 and max
-        dur = rand() * dur_max
+        dur = random.random() * dur_max
         time.sleep(dur)
 
     def shouldRetry(self, iter, err):