macOS

Fix str encode in ractors #9070

Job	Run time
make (test-bundler-parallel, macos-14)	25m 12s
make (check, macos-14)	6m 21s
make (check, macos-14, --with-gcc=gcc-14)	6m 49s
make (check, macos-15)	6m 44s
make (test-bundled-gems, macos-14)	10m 54s
make (check, macos-13)	12m 32s
make (check, macos-14, --with-gmp)	6m 41s
make (test-all, --repeat-count=2, macos-14)	8m 28s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	6m 18s
macOS result	3s
	1h 30m 2s

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