ci: switch to macos version 15 #1432

Job	Run time
build (linux-gcc)	15m 9s
build (linux-clang)	14m 8s
build (linux-i686-gcc)	14m 20s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	51s
build (android)	49s
build (windows-cygwin-64)	15m 20s
build (windows-cygwin-32)	16m 47s
build (macos)	19s
build-containers (debian, debian, bookworm, x86_64)	13m 48s
build-containers (alma, almalinux, 9, x86_64)	14m 56s
build-containers (oracle, oraclelinux, 9, x86_64)	14m 59s
build (windows-msys2-64)	14m 9s
build-containers (ubuntu, ubuntu, noble, i686)	14m 5s
build-containers (fedora, fedora, 40, x86_64)	14m 48s
build-containers (rocky, rockylinux, 9, x86_64)	15m 10s
build-containers (ubuntu, ubuntu, noble, x86_64)	14m 4s
	3h 13m 42s

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