feat(core): Updated at core version to 239a73b9

- feat(pm): Added the sleep support for esp32c5
- feat(wifi): AT+CWLAP supports to choose channels for esp32c5
- feat(wifi): Added the AT+CWBANDMODE command to configurate the band mode of wifi for esp32c5
- fix(FCS-1641): Fixed the issue where AT+CIPSTO did not work when data send failed
- fix(ble): Fixed the issue where the ble was not working in the silence firmware on esp32c6

Author: ustccw

components/at/lib/VERSION

@@ -1,6 +1,6 @@
-ESP32:   ba52610
-ESP32C3: ba52610
-ESP32C2: ba52610
-ESP32C5: 8834929
-ESP32C6: ba52610
-ESP32S2: ba52610
+ESP32:   239a73b
+ESP32C3: 239a73b
+ESP32C2: 239a73b
+ESP32C5: 239a73b
+ESP32C6: 239a73b
+ESP32S2: 239a73b