MultipleBlinks: fix Nano RP2040 Connect build

Fixes CI and explains a bit why RGB leds can't be used directly by Nano RP2040 Connect

Author: facchinm

libraries/Scheduler/examples/MultipleBlinks/MultipleBlinks.ino

@@ -25,10 +25,23 @@
 // Include Scheduler since we want to manage multiple tasks.
 #include <Scheduler.h>
 
+// On Nano RP2040 Connect, RGB leds are connected to the wifi module
+// The user APIs are the same, but we can't convert to int, so use defines
+#if defined(ARDUINO_NANO_RP2040_CONNECT)
+
+#include "WiFiNINA.h"
+#define led1  LEDR
+#define led2  LEDG
+#define led3  LEDB
+
+#else
+
 int led1 = LEDR;
 int led2 = LEDG;
 int led3 = LEDB;
 
+#endif
+
 void setup() {
   Serial.begin(9600);