ci: replace deprecated macOS-13 with macOS-15 #435

Job	Run time
check_format	39s
run_tests_mingw_linux_32	29s
run_tests_mingw_linux_64	44s
run_tests_mingw_windows_64	2m 57s
run_tests_unix (ubuntu-latest, nasm)	1m 36s
run_tests_linux-riscv64-v	41m 2s
run_tests_unix (macos-15-intel, nasm)	1m 22s
run_tests_unix (macos-14, nasm)	1m 38s
run_tests_windows	4m 24s
	54m 51s

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