test: GCC 13 fix for limits.cc

GCC complains that #include <cstdint> is missing, so add that.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

test/limits.cc

@@ -3,6 +3,7 @@
 #include "crucible/limits.h"
 
 #include <cassert>
+#include <cstdint>
 
 using namespace crucible;