feat(core): Updated at core version to f3fe553b

- feat(ESPAT-2356): AT+MDNS added mdns query support
- fix(ESPAT-2393): Fixed a missing scandone issue if AT+BLESCAN=0 (nimble)
- fix(ESPAT-2356): Fixed pairing info not saved when using <auth_req>=1 (BOND) during pairing (nimble)
- fix(ESPAT-2394): Fixed an issue with ble sending successful when the connection is disconnected (nimble)
- fix(ESPAT-2374): Fixed an issue where BluFi would fail to connect to the network the second time
- fix(ESPAT-2395): Fixed an issue if data loss in ble passthrough mode (nimble)

Author: ustccw

components/at/lib/VERSION

@@ -1,6 +1,6 @@
-ESP32:   d5d340f
-ESP32C3: d5d340f
-ESP32C2: d5d340f
-ESP32C5: d5d340f
-ESP32C6: d5d340f
-ESP32S2: d5d340f
+ESP32:   f3fe553
+ESP32C3: f3fe553
+ESP32C2: f3fe553
+ESP32C5: f3fe553
+ESP32C6: f3fe553
+ESP32S2: f3fe553