car_helpers: don't log fingerprints as a dict (commaai#31289)

Update car_helpers.py

selfdrive/car/car_helpers.py

@@ -187,15 +187,15 @@ def fingerprint(logcan, sendcan, num_pandas):
 
   cloudlog.event("fingerprinted", car_fingerprint=car_fingerprint, source=source, fuzzy=not exact_match, cached=cached,
                  fw_count=len(car_fw), ecu_responses=list(ecu_rx_addrs), vin_rx_addr=vin_rx_addr, vin_rx_bus=vin_rx_bus,
-                 fingerprints=finger, fw_query_time=fw_query_time, error=True)
+                 fingerprints=repr(finger), fw_query_time=fw_query_time, error=True)
   return car_fingerprint, finger, vin, car_fw, source, exact_match
 
 
 def get_car(logcan, sendcan, experimental_long_allowed, num_pandas=1):
   candidate, fingerprints, vin, car_fw, source, exact_match = fingerprint(logcan, sendcan, num_pandas)
 
   if candidate is None:
-    cloudlog.event("car doesn't match any fingerprints", fingerprints=fingerprints, error=True)
+    cloudlog.event("car doesn't match any fingerprints", fingerprints=repr(fingerprints), error=True)
     candidate = "mock"
 
   CarInterface, CarController, CarState = interfaces[candidate]