fix(uart): sleep retention (#10248)

* fix(uart): sleep retention

sets new flag from IDF 5.3 that causes error with Serial.begin(115200).

* fix(typo): typo and commentaries

* feat(uart): adds memset to make structure empty

* fix(uart): missing parentesis - typo

* ci(pre-commit): Apply automatic fixes

---------

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

cores/esp32/esp32-hal-uart.c

@@ -497,6 +497,8 @@ uart_t *uartBegin(
     log_v("UART%d not installed. Starting installation", uart_nr);
   }
   uart_config_t uart_config;
+  memset(&uart_config, 0, sizeof(uart_config_t));
+  uart_config.flags.backup_before_sleep = false;  // new flag from IDF v5.3
   uart_config.data_bits = (config & 0xc) >> 2;
   uart_config.parity = (config & 0x3);
   uart_config.stop_bits = (config & 0x30) >> 4;