macOS

Fix an off by one in `rb_ary_resize` #589

Job	Run time
make (check, macos-14)	7m 15s
make (check, macos-14, --with-gcc=gcc-14)	8m 42s
make (test-all, --repeat-count=2, macos-14)	9m 36s
make (test-bundler-parallel, macos-14)	17m 37s
make (test-bundled-gems, macos-14)	9m 55s
make (check, macos-15)	7m 43s
make (check, macos-13)	15m 3s
macOS result	1s
	1h 15m 52s

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