GitHub Actions: support macOS 15 #4988

Job	Run time
FreeBSD Debug x86_64	6m 47s
Windows Debug x64 (msvc)	8m 20s
FreeBSD Release x86_64	9m 43s
Ubuntu Debug amd64 (gcc)	5m 46s
Windows Debug x86 (msvc)	35m 12s
OpenBSD Debug x86_64	11m 38s
Ubuntu Release amd64 (gcc)	6m 7s
Windows Mixed x64 (msvc)	5m 17s
OpenBSD Release x86_64	10m 4s
Windows Mixed x86 (msvc)	5m 59s
Ubuntu Debug amd64 (clang)	6m 51s
NetBSD Debug x86_64	10m 17s
Windows Release x64 (msvc)	9m 56s
Ubuntu Release amd64 (clang)	9m 43s
NetBSD Release x86_64	9m 15s
Windows Release x86 (msvc)	9m 41s
Alpine Debug x86_64 (gcc)	6m 49s
Windows Release Master Gold x64 (msvc)	9m 42s
Alpine Release x86_64 (gcc)	9m 37s
Windows Release Master Gold x86 (msvc)	9m 7s
Alpine Debug x86 (gcc)	7m 6s
Alpine Release x86 (gcc)	9m 31s
Fedora Debug x86_64 (gcc)	17m 0s
Fedora Release x86_64 (gcc)	14m 39s
macOS 13 Debug x86_64 (clang)	6m 52s
macOS 13 Release x86_64 (clang)	9m 25s
macOS 14 Debug arm64 (clang)	4m 10s
macOS 14 Release arm64 (clang)	6m 14s
macOS 15 Debug arm64 (clang)	4m 14s
macOS 15 Release arm64 (clang)	5m 14s
	4h 40m 16s

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