presage C++20 becoming the default #9340

Job	Run time
MacOS (macOS-15-intel)	29m 3s
MacOS (macOS-15)	21m 23s
Windows (installer, intel)	23m 53s
Windows (check, arm)	55m 26s
Windows (installer, arm)	24m 23s
Windows (check, intel)	51m 5s
Linux (gcc, debian:stable, intel)	32m 12s
Linux (gcc, debian:stable, arm)	31m 37s
Linux (clang, debian:stable, arm)	32m 17s
Linux (gcc, debian:testing, arm)	33m 44s
Linux (clang, debian:testing, arm)	34m 29s
Linux (clang, debian:testing, intel)	34m 54s
Linux (clang, debian:stable, intel)	34m 33s
Linux (gcc, debian:testing, intel)	36m 1s
	7h 55m 0s

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