Merge branch 'fix/brownout_crash_v5.1' into 'release/v5.1'

fix(brownout): fixed brownout isr crashing if cache disabled (v5.1)

See merge request espressif/esp-idf!30833

components/esp_system/port/brownout.c

@@ -28,7 +28,7 @@
 #define BROWNOUT_DET_LVL 0
 #endif
 
-static __attribute__((unused)) DRAM_ATTR const char *TAG = "BOD";
+static __attribute__((unused)) DRAM_ATTR const char TAG[] = "BOD";
 
 #if CONFIG_ESP_SYSTEM_BROWNOUT_INTR
 IRAM_ATTR static void rtc_brownout_isr_handler(void *arg)