bugfix: add <stdint.h> for uint8_t to avoid compilation failure (GCC 11.2.0) (#7744)

cores/esp32/FunctionalInterrupt.h

@@ -9,6 +9,7 @@
 #define CORE_CORE_FUNCTIONALINTERRUPT_H_
 
 #include <functional>
+#include <stdint.h>
 
 struct InterruptArgStructure {
 	std::function<void(void)> interruptFunction;