fix(rgbled): new Arduino style depreacted attribute

Author: SuGlider

Diff for: cores/esp32/esp32-hal-rgb-led.h

@@ -30,7 +30,8 @@ void rgbLedWriteOrdered(uint8_t pin, rgb_led_color_order_t order, uint8_t red_va
 void rgbLedWrite(uint8_t pin, uint8_t red_val, uint8_t green_val, uint8_t blue_val);
 
 // Backward compatibility - Deprecated. It will be removed in future releases.
-void neopixelWrite(uint8_t p, uint8_t r, uint8_t g, uint8_t b) __attribute__((deprecated("Use rgbLedWrite().")));
+[[deprecated("Use rgbLedWrite() instead.")]]
+void neopixelWrite(uint8_t p, uint8_t r, uint8_t g, uint8_t b);
 
 #ifdef __cplusplus
 }