Update certificate in the examples for OTA (#1213)

update certificate to the root authority

docs/use/gateway.md

@@ -116,32 +116,31 @@ The `server_cert` parameter is optional. If the update server has changed or cer
 
 ### Example firmware update message:
 ```
-mosquitto_pub -t "home/<gateway_name>/commands/firmware_update" -m '{
+mosquitto_pub -t "home/OpenMQTTGateway_ESP32_BLE/commands/firmware_update" -m '{
   "version": "test",
   "password": "OTAPASSWORD",
-  "url": "https://github.com/1technophile/OpenMQTTGateway/releases/download/v0.9.7/esp32dev-ble-firmware.bin",
+  "url": "https://github.com/1technophile/OpenMQTTGateway/releases/download/v0.9.12/esp32dev-ble-firmware.bin",
   "server_cert": "-----BEGIN CERTIFICATE-----
-MIIDxTCCAq2gAwIBAgIQAqxcJmoLQJuPC3nyrkYldzANBgkqhkiG9w0BAQUFADBs
+MIIDrzCCApegAwIBAgIQCDvgVpBCRrGhdWrJWZHHSjANBgkqhkiG9w0BAQUFADBh
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 -----END CERTIFICATE-----"}'
 ```