gcc >= 14 supports gnu23 #9674

Job	Run time
MacOS (macOS-15-intel)	49m 11s
MacOS (macOS-15)	23m 54s
Windows (installer, intel)	23m 45s
Windows (check, intel)	54m 5s
Windows (installer, arm)	24m 30s
Windows (check, arm)	55m 50s
Linux (clang, debian:testing, arm)	32m 31s
Linux (gcc, debian:testing, intel)	35m 34s
Linux (gcc, debian:testing, arm)	32m 50s
Linux (gcc, debian:stable, arm)	33m 38s
Linux (clang, debian:stable, arm)	32m 48s
Linux (clang, debian:stable, intel)	36m 31s
Linux (clang, debian:testing, intel)	32m 1s
Linux (gcc, debian:stable, intel)	35m 23s
	8h 22m 31s

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