Use INPUT_PULLUP instead of INPUT

Tested on some of the popular S3 board bought from Amazon, the digitalRead of an INPUT pin is LOW, which stops the timer right after start.
Setting it to INPUT_PULLUP will fix it.

libraries/ESP32/examples/Timer/RepeatTimer/RepeatTimer.ino

@@ -33,7 +33,7 @@ void setup() {
   Serial.begin(115200);
 
   // Set BTN_STOP_ALARM to input mode
-  pinMode(BTN_STOP_ALARM, INPUT);
+  pinMode(BTN_STOP_ALARM, INPUT_PULLUP);
 
   // Create semaphore to inform us when the timer has fired
   timerSemaphore = xSemaphoreCreateBinary();