fix(misc): Use 64 bit return value for micros()

Author: leandromattioli

cores/esp32/esp32-hal-misc.c

@@ -191,8 +191,8 @@ BaseType_t xTaskCreateUniversal(
 #endif
 }
 
-unsigned long ARDUINO_ISR_ATTR micros() {
-  return (unsigned long)(esp_timer_get_time());
+unsigned long long ARDUINO_ISR_ATTR micros() {
+  return (unsigned long long)(esp_timer_get_time());
 }
 
 unsigned long ARDUINO_ISR_ATTR millis() {

cores/esp32/esp32-hal.h

@@ -121,7 +121,7 @@ BaseType_t xTaskCreateUniversal(
   TaskHandle_t *const pxCreatedTask, const BaseType_t xCoreID
 );
 
-unsigned long micros();
+unsigned long long micros();
 unsigned long millis();
 void delay(uint32_t);
 void delayMicroseconds(uint32_t us);