Add missing includes for gcc 13.1: (#4555)

gcc 13.1 failed to compile due to missing headers. This patch adds the
needed headers.

src/ripple/basics/StringUtilities.h

@@ -25,7 +25,9 @@
 
 #include <boost/format.hpp>
 #include <boost/utility/string_view.hpp>
+
 #include <array>
+#include <cstdint>
 #include <optional>
 #include <sstream>
 #include <string>

src/ripple/basics/base64.h

@@ -57,6 +57,7 @@
 #ifndef RIPPLE_BASICS_BASE64_H_INCLUDED
 #define RIPPLE_BASICS_BASE64_H_INCLUDED
 
+#include <cstdint>
 #include <string>
 
 namespace ripple {