👷 Use dependabot on cpp20 branch #970

Job	Run time
valgrind	5m 35s
quality_checks_pass	47s
mutate	5m 35s
sanitize (thread, gcc)	4m 39s
sanitize (address, clang)	6m 17s
sanitize (address, gcc)	4m 40s
sanitize (undefined, clang)	6m 23s
sanitize (thread, clang)	6m 13s
sanitize (undefined, gcc)	5m 1s
build_and_test_24 (clang, 18, 23, libc++, Debug)	7m 45s
build_and_test_24 (clang, 19, 23, libc++, Debug)	6m 15s
build_and_test_24 (clang, 20, 23, libstdc++, Debug)	5m 52s
build_and_test_24 (gcc, 14, 23, libstdc++, Debug)	5m 8s
build_and_test_24 (clang, 18, 23, libstdc++, Debug)	5m 46s
build_and_test_24 (clang, 22, 23, libstdc++, Debug)	6m 12s
build_and_test_24 (gcc, 13, 23, libstdc++, Debug)	4m 28s
build_and_test_24 (clang, 21, 23, libstdc++, Debug)	5m 28s
build_and_test_24 (clang, 20, 23, libc++, Debug)	6m 40s
build_and_test_24 (gcc, 12, 23, libstdc++, Debug)	4m 36s
build_and_test_24 (clang, 21, 23, libc++, Debug)	6m 28s
build_and_test_24 (clang, 19, 23, libstdc++, Debug)	6m 5s
build_and_test_24 (clang, 22, 23, libc++, Debug)	6m 31s
merge_ok	4s
	2h 2m 28s

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