test

Merge pull request #289 from alex-sparus/remove-cpp20-requirement #470

Job	Run time
build	19m 32s
docs	2m 4s
build-spm	17s
check (Debug, gnu-6, 14)	3m 7s
check (Debug, gnu-7, 14)	3m 8s
check (Debug, llvm-5, 14)	2m 47s
check (Debug, llvm-6, 14)	3m 27s
check (Release, gnu-6, 14)	3m 47s
check (Release, gnu-7, 14)	3m 48s
check (Release, llvm-5, 14)	4m 4s
check (Release, llvm-6, 14)	4m 25s
check (Debug, gnu-9, 14, coverage)	4m 11s
check (Debug, gnu-8, 17)	3m 10s
check (Debug, llvm-9, 17, fuzzers)	4m 10s
check (Debug, gnu-11, 20)	3m 39s
check (Debug, llvm-13, 20)	3m 11s
check (Debug, llvm-8, 14, sanitize)	4m 10s
check (Release, gnu-9, 14, benchmark)	18m 53s
check (Release, llvm-10, 14, benchmark)	21m 14s
	1h 53m 4s

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