lokinet: fix `gcc-13` build
Without the change build fails as
https://hydra.nixos.org/build/247545813:
In file included from /build/source/llarp/util/thread/queue_manager.cpp:1:
/build/source/llarp/util/thread/queue_manager.hpp:68:44: error: 'uint32_t' is not a member of 'std'; did you mean 'wint_t'?
68 | using AtomicIndex = std::atomic<std::uint32_t>;
| ^~~~~~~~
| wint_t