ci: bump layouting.yml to macos-15 #2

Job	Run time
build (ubuntu-24.04, ci-dev-qt5, 5.15)	25m 54s
build (ubuntu-24.04, ci-release-qt5, 5.15)	2m 52s
build (ubuntu-24.04, ci-qtwidgets-qt5, 5.15)	2m 36s
build (ubuntu-24.04, ci-qtquick-qt5, 5.15)	2m 28s
build (windows-latest, ci-dev-qt5, 5.15)	27m 45s
build (windows-latest, ci-release-qt5, 5.15)	3m 17s
build (windows-latest, ci-qtwidgets-qt5, 5.15)	3m 20s
build (windows-latest, ci-qtquick-qt5, 5.15)	2m 27s
build (macos-13, ci-dev-qt5, 5.15)	24m 53s
build (macos-13, ci-release-qt5, 5.15)	2m 56s
build (macos-13, ci-qtwidgets-qt5, 5.15)	2m 7s
build (macos-13, ci-qtquick-qt5, 5.15)	2m 17s
	1h 42m 52s

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