libcarla: Fix compile error with gcc >=13

The error was:

    LibCarla/source/carla/client/FileTransfer.h:31:57: error: 'uint8_t' was not declared in this scope
       31 |     static bool WriteFile(std::string path, std::vector<uint8_t> content);
          |                                                         ^~~~~~~

LibCarla/source/carla/client/FileTransfer.h

@@ -12,6 +12,7 @@
 #include <iostream>
 #include <string>
 #include <sys/stat.h>
+#include <cstdint>
 
 namespace carla {
 namespace client {