shared_token_bucket: resolve FIXME #228

Job	Run time
Test (clang++, C++20, debug) / test	15m 39s
Test with DPDK enabled / test	24m 19s
Test with C++20 modules enabled / test	13m 21s
Test (clang++, C++20, dev) / test	9m 10s
Test (clang++, C++20, release) / test	15m 57s
Test (clang++, C++23, dev) / test	16m 45s
Test (clang++, C++23, debug) / test	16m 20s
Test (clang++, C++23, release) / test	15m 2s
Test (g++, C++20, debug) / test	18m 51s
Test (g++, C++20, dev) / test	13m 19s
Test (g++, C++20, release) / test	17m 6s
Test (g++, C++23, debug) / test	18m 59s
Test (g++, C++23, dev) / test	9m 2s
Test (g++, C++23, release) / test	17m 17s
	3h 41m 7s

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