gate: check: mark as const #762

Job	Run time
Test with DPDK enabled / test	18m 10s
Test with C++20 modules enabled / test	11m 28s
Test (clang++, C++20, debug) / test	12m 39s
Test (clang++, C++20, dev) / test	9m 46s
Test (clang++, C++20, release) / test	10m 41s
Test (clang++, C++23, debug) / test	12m 38s
Test (clang++, C++23, release) / test	16m 8s
Test (clang++, C++23, dev) / test	10m 2s
Test (g++, C++20, debug) / test	17m 9s
Test (g++, C++20, dev) / test	9m 19s
Test (g++, C++20, release) / test	13m 20s
Test (g++, C++23, debug) / test	17m 35s
Test (g++, C++23, dev) / test	9m 5s
Test (g++, C++23, release) / test	14m 13s
	3h 2m 13s

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