Use C++ cctype header in debug_dump

Replace `#include <ctype.h>` with `#include <cctype>` in `debug_dump.h` to align with C++ standard library header conventions.

Author: vanvught

common/include/firmware/debug/debug_dump.h

@@ -28,7 +28,7 @@
 
 #include <cstdint>
 #include <cstdio>
-#include <ctype.h>
+#include <cctype>
 
 #include "firmware/debug/debug_config.h"