GitHub Actions: support macOS 15 (#1717) #4989

Job	Run time
FreeBSD Debug x86_64	6m 56s
FreeBSD Release x86_64	9m 45s
Windows Debug x64 (msvc)	6m 3s
Ubuntu Debug amd64 (gcc)	6m 11s
OpenBSD Debug x86_64	11m 8s
Windows Debug x86 (msvc)	35m 12s
Ubuntu Release amd64 (gcc)	6m 22s
Windows Mixed x64 (msvc)	5m 53s
Ubuntu Debug amd64 (clang)	7m 1s
OpenBSD Release x86_64	9m 43s
Ubuntu Release amd64 (clang)	9m 37s
NetBSD Debug x86_64	11m 0s
Windows Mixed x86 (msvc)	5m 33s
Alpine Debug x86_64 (gcc)	6m 31s
Windows Release x64 (msvc)	10m 25s
NetBSD Release x86_64	9m 6s
Alpine Release x86_64 (gcc)	8m 41s
Windows Release x86 (msvc)	10m 29s
Alpine Debug x86 (gcc)	7m 2s
Windows Release Master Gold x64 (msvc)	8m 45s
Alpine Release x86 (gcc)	9m 17s
Windows Release Master Gold x86 (msvc)	9m 5s
Fedora Debug x86_64 (gcc)	16m 56s
Fedora Release x86_64 (gcc)	14m 38s
macOS 13 Debug x86_64 (clang)	7m 26s
macOS 13 Release x86_64 (clang)	10m 50s
macOS 14 Debug arm64 (clang)	4m 5s
macOS 14 Release arm64 (clang)	5m 9s
macOS 15 Debug arm64 (clang)	4m 12s
macOS 15 Release arm64 (clang)	5m 21s
	4h 38m 22s

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