change(core): Updated at core version to 39c513ee

- feat(ESPAT-2388): Added AT+CIPCONNPERSIST command to keep tcp/udp/ssl connection after netif changes
- fix(ble): Fixed send indication failure
- fix(user): Fixed missing wake-up signal before active data write
- fix(ESPAT-2253): Fixed potential incorrect MAC address in "+BTSPPDISCONN"
- fix(ESPAT-2425): Fixed incorrect conn_index when AT works as ble master + slave
- fix(ESPAT-2212): Fixed BLE service creation failure when AT works as ble master + slave
- fix(ESPAT-2397): Fixed redundant disconnect print in passthrough mode
- fix(ESPAT-2392): Fixed incorrect conn_index in passthrough mode
- fix(ESPAT-2402): Fixed potential crash due to missing ble nvs data sanity check
- fix(FCS-1688): Fixed inability to enter ble passthrough mode with custom ble service
- fix(ESPAT-2422): Fixed out-of-order parameters in AT+BLEGATTSSRV query result
- fix(ESPAT-1530): Fixed multiple link IDs connecting to the same MAC address
- fix(ESPAT-2210): Fixed missing connection failure information
- fix(ble): Fixed PHY update failure status not obtained in advance

Author: ustccw

components/at/lib/VERSION

@@ -1,6 +1,6 @@
-ESP32:   b0fe7e5
-ESP32C3: b0fe7e5
-ESP32C2: b0fe7e5
-ESP32C5: b0fe7e5
-ESP32C6: b0fe7e5
-ESP32S2: b0fe7e5
+ESP32:   39c513e
+ESP32C3: 39c513e
+ESP32C2: 39c513e
+ESP32C5: 39c513e
+ESP32C6: 39c513e
+ESP32S2: 39c513e