🔥 Remove pre-c++23 compiler macros #994

Job	Run time
valgrind	5m 56s
mutate	5m 33s
quality_checks_pass	1m 13s
sanitize (undefined, clang)	6m 13s
sanitize (thread, clang)	6m 0s
sanitize (thread, gcc)	4m 38s
sanitize (undefined, gcc)	5m 1s
sanitize (address, clang)	5m 44s
sanitize (address, gcc)	4m 43s
build_and_test_24 (clang, 19, 23, libc++, Debug)	6m 10s
build_and_test_24 (clang, 19, 23, libstdc++, Debug)	6m 7s
build_and_test_24 (clang, 18, 23, libstdc++, Debug)	5m 34s
build_and_test_24 (gcc, 13, 23, libstdc++, Debug)	5m 3s
build_and_test_24 (clang, 21, 23, libc++, Debug)	6m 16s
build_and_test_24 (gcc, 12, 23, libstdc++, Debug)	4m 18s
build_and_test_24 (clang, 20, 23, libstdc++, Debug)	5m 54s
build_and_test_24 (clang, 22, 23, libc++, Debug)	6m 20s
build_and_test_24 (clang, 22, 23, libstdc++, Debug)	6m 5s
build_and_test_24 (clang, 21, 23, libstdc++, Debug)	5m 30s
build_and_test_24 (clang, 20, 23, libc++, Debug)	6m 23s
build_and_test_24 (gcc, 14, 23, libstdc++, Debug)	5m 17s
build_and_test_24 (clang, 18, 23, libc++, Debug)	7m 25s
merge_ok	4s
	2h 1m 27s

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