Bug 1843535 - Apply upstream patch to fix building librnp with gcc-13. r=kaie

Cherry pick bd8f7d2510
to fix building with gcc-13.

Differential Revision: https://phabricator.services.mozilla.com/D183791

--HG--
extra : moz-landing-system : lando

third_party/rnp/src/libsexp/include/sexp/sexp-error.h

@@ -29,6 +29,7 @@
 
 #pragma once
 
+#include <cstdint>
 #include <exception>
 #include <iostream>
 #include <string>